List of computing and IT abbreviations

This is a list of computing and IT acronyms, initialisms and abbreviations.

0–9

 * 1GL—First-Generation Programming Language
 * 1NF—First Normal Form
 * 10B2—10BASE-2
 * 10B5—10BASE-5
 * 10B-F—10BASE-F
 * 10B-FB—10BASE-FB
 * 10B-FL—10BASE-FL
 * 10B-FP—10BASE-FP
 * 10B-T—10BASE-T
 * 100B-FX—100BASE-FX
 * 100B-TX—100BASE-TX
 * 100BVG—100BASE-VG
 * 286—Intel 80286 processor
 * 2B1Q—2 Binary 1 Quaternary
 * 2FA—Two-factor authentication
 * 2GL—Second-Generation Programming Language
 * 2NF—Second Normal Form
 * 3GL—Third-Generation Programming Language
 * 3GPP—3rd Generation Partnership Project – 3G comms
 * 3GPP2—3rd Generation Partnership Project 2
 * 3NF—Third Normal Form
 * 386—Intel 80386 processor
 * 486—Intel 80486 processor
 * 4B5BLF—4-bit 5-bit Local Fiber
 * 4GL—Fourth-Generation Programming Language
 * 4NF—Fourth Normal Form
 * 5GL—Fifth-Generation Programming Language
 * 5NF—Fifth Normal Form
 * 6NF—Sixth Normal Form
 * 8B10BLF—8-bit 10-bit Local Fiber
 * 802.11—Wireless LAN

A

 * A11Y—Accessibility
 * AAA—Authentication Authorization, Accounting
 * AABB—Axis Aligned Bounding Box
 * AAC—Advanced Audio Coding
 * AAL—ATM Adaptation Layer
 * AALC—ATM Adaptation Layer Connection
 * AARP—AppleTalk Address Resolution Protocol
 * ABAC—Attribute-Based Access Control
 * ABCL—Actor-Based Concurrent Language
 * ABI—Application Binary Interface
 * ABM—Asynchronous Balanced Mode
 * ABR—Area Border Router
 * ABR—Auto Baud-Rate detection
 * ABR—Available Bitrate
 * ABR—Average Bitrate
 * ABR—Adaptive Bitrate (Streaming)
 * AC—Acoustic Coupler
 * AC—Alternating Current
 * ACD—Automatic Call Distributor
 * ACE—Advanced Computing Environment
 * ACID—Atomicity Consistency Isolation Durability
 * ACK—ACKnowledgement
 * ACK—Amsterdam Compiler Kit
 * ACL—Access Control List
 * ACL—Active Current Loop
 * ACM—Association for Computing Machinery
 * ACME—Automated Classification of Medical Entities
 * ACP—Airline Control Program
 * ACPI—Advanced Configuration and Power Interface
 * ACR—Allowed Cell Rate
 * ACR—Attenuation to Crosstalk Ratio
 * AD—Active Directory
 * AD—Administrative Domain
 * ADC—Analog-to-Digital Converter
 * ADC—Apple Display Connector
 * ADB—Apple Desktop Bus
 * ADCCP—Advanced Data Communications Control Procedures
 * ADO—ActiveX Data Objects
 * ADSL—Asymmetric Digital Subscriber Line
 * ADT—Abstract Data Type
 * AE—Adaptive Equalizer
 * AES—Advanced Encryption Standard
 * AF—Anisotropic Filtering
 * AFP—Apple Filing Protocol
 * AGI—Artificial General Intelligence
 * AGP—Accelerated Graphics Port
 * AH—Active Hub
 * AI—Artificial Intelligence
 * AIX—Advanced Interactive eXecutive
 * Ajax—Asynchronous JavaScript and XML
 * AL—Active Link
 * AL—Access List
 * ALAC—Apple Lossless Audio Codec
 * ALGOL—Algorithmic Language
 * ALSA—Advanced Linux Sound Architecture
 * ALU—Arithmetic and Logical Unit
 * AM—Access Method
 * AM—Active Matrix
 * AMOLED—Active-Matrix Organic Light-Emitting Diode
 * AM—Active Monitor
 * AM—Allied Mastercomputer
 * AM—Amplitude Modulation
 * AMD—Advanced Micro Devices
 * AMQP—Advanced Message Queuing Protocol
 * AMR—Audio Modem Riser
 * ANN—Artificial Neural Network
 * ANSI—American National Standards Institute
 * ANT—Another Neat Tool
 * AoE—ATA over Ethernet
 * AOP—Aspect-Oriented Programming
 * AOT—Ahead-Of-Time
 * APCI—Application-Layer Protocol Control Information
 * API—Application Programming Interface
 * APIC—Advanced Programmable Interrupt Controller
 * APIPA—Automatic Private IP Addressing
 * APL—A Programming Language
 * APR—Apache Portable Runtime
 * ARC—Adaptive Replacement Cache
 * ARC—Advanced RISC Computing
 * ARIN—American Registry for Internet Numbers
 * ARM—Advanced RISC Machines
 * AROS—AROS Research Operating System
 * ARP—Address Resolution Protocol
 * ARPA—Address and Routing Parameter Area
 * ARPA—Advanced Research Projects Agency
 * ARPANET—Advanced Research Projects Agency Network
 * AS—Access Server
 * ASCII—American Standard Code for Information Interchange
 * AuthIP—Authenticated Internet Protocol
 * ASG—Abstract Semantic Graph
 * ASIC—Application-Specific Integrated Circuit
 * ASIMO—Advanced Step in Innovative Mobility
 * ASLR—Address Space Layout Randomization
 * ASM—Algorithmic State Machine
 * ASMP—Asymmetric Multiprocessing
 * ASN.1—Abstract Syntax Notation 1
 * ASP—Active Server Pages
 * ASP—Application Service Provider
 * ASR—Asynchronous Signal Routine
 * AST—Abstract Syntax Tree
 * AT—Advanced Technology
 * AT—Access Time
 * AT—Active Terminator
 * ATA—Advanced Technology Attachment
 * ATAG—Authoring Tool Accessibility Guidelines
 * ATAPI—Advanced Technology Attachment Packet Interface
 * ATM—Asynchronous Transfer Mode
 * AuthN—Authentication
 * AuthZ—Authorization
 * AV—Antivirus
 * AVC—Advanced Video Coding
 * AVI—Audio Video Interleaved
 * AWK—Aho Weinberger Kernighan
 * AWS—Amazon Web Services
 * AWT—Abstract Window Toolkit

B

 * B2B—Business-to-Business
 * B2C—Business-to-Consumer
 * B2E—Business-to-Employee
 * BAL—Basic Assembly Language
 * BAM—Block Availability Map
 * Bash—Bourne-again shell
 * BASIC—Beginner's All-Purpose Symbolic Instruction Code
 * BBP—Baseband Processor
 * BBS—Bulletin Board System
 * BC—Business Continuity
 * BCC—Blind Carbon Copy
 * BCD—Binary Coded Decimal
 * BCD—Boot Configuration Data
 * BCNF—Boyce–Codd normal form
 * BCP—Business Continuity Planning
 * BCP—Best Current Practice
 * BE—Backend
 * BEEP—Blocks Extensible Exchange Protocol
 * BER—Bit Error Rate
 * BFD—Bidirectional Forwarding Detection
 * BFD—Binary File Descriptor
 * BFS—Breadth-First Search
 * BFT—Byzantine Fault Tolerant
 * BGP—Border Gateway Protocol
 * BI—Business Intelligence
 * BiDi—Bi-Directional
 * bin—binary
 * BINAC—Binary Automatic Computer
 * BIND—Berkeley Internet Name Domain
 * BIOS—Basic Input Output System
 * BJT—Bipolar Junction Transistor
 * bit—binary digit
 * Blob—Binary large object
 * Blog—Web Log
 * BMP—Basic Multilingual Plane
 * BNC—Baby Neill Constant
 * BOINC—Berkeley Open Infrastructure for Network Computing
 * BOM—Byte Order Mark
 * BOOTP—Bootstrap Protocol
 * BPDU—Bridge Protocol Data Unit
 * BPEL—Business Process Execution Language
 * BPL—Broadband over Power Lines
 * BPM—Business Process Management
 * BPM—Business Process Modeling
 * bps—bits per second
 * BRM—Business Reference Model
 * BRMS—Business Rule Management System
 * BRR—Business Readiness Rating
 * BRS—Broadband Radio Service
 * BSA—Business Software Alliance
 * BSB—Backside Bus
 * BSD—Berkeley Software Distribution
 * BSoD—Blue Screen of Death
 * BSS—Block Started by Symbol
 * BT—BitTorrent
 * BT—Bluetooth
 * B TAM—Basic Telecommunications Access Method
 * BW—Bandwidth
 * BYOD—Bring Your Own Device
 * Byte—By eight (group of 8 bits)

C

 * CA—Computer Accountancy
 * CAD—Computer-Aided Design
 * CAE—Computer-Aided Engineering
 * CAID—Computer-Aided Industrial Design
 * CAI—Computer-Aided Instruction
 * CAM—Computer-Aided Manufacturing
 * CAP—Consistency Availability Partition tolerance (theorem)
 * CAPTCHA—Completely Automated Public Turing Test to tell Computers and Humans Apart
 * CAT—Computer-Aided Translation
 * CAQ—Computer-Aided Quality Assurance
 * CASE—Computer-Aided Software Engineering
 * cc—C Compiler
 * CC—Carbon Copy
 * CD—Compact Disc
 * CDE—Common Desktop Environment
 * CDFS—Compact Disk File System
 * CDMA—Code-Division Multiple Access
 * CDN—Content Delivery Network
 * CDP—Cisco Discovery Protocol
 * CDP—Continuous Data Protection
 * CD-R—CD-Recordable
 * CD-ROM—CD Read-Only Memory
 * CD-RW—CD-Rewritable
 * CDSA—Common Data Security Architecture
 * CERT—Computer Emergency Response Team
 * CES—Consumer Electronics Show
 * CF—Compact Flash
 * CFD—Computational Fluid Dynamics
 * CFG—Context-Free Grammar
 * CFG—Control-Flow Graph
 * CG—Computer Graphics
 * CGA—Color Graphics Array
 * CGI—Common Gateway Interface
 * CGI—Computer-Generated Imagery
 * CGT—Computational Graph Theory
 * CHAP—Challenge-Handshake Authentication Protocol
 * CHS—Cylinder-Head-Sector
 * CIDR—Classless Inter-Domain Routing
 * CIFS—Common Internet Filesystem
 * CIM—Common Information Model
 * CIM—Computationally Independent Model
 * CIO—Chief Information Officer
 * CIR—Committed information rate
 * CISC—Complex Instruction Set Computer
 * CJK—Chinese, Japanese, and Korean
 * CJKV—Chinese, Japanese, Korean, and Vietnamese
 * CLI—Command Line Interface
 * CLR—Common Language Runtime
 * CM—Configuration Management
 * CM—Content Management
 * CMDB—Configuration Management Database
 * CMMI—Capability Maturity Model Integration
 * CMOS—Complementary Metal-Oxide Semiconductor
 * CMO—Current Mode of Operation
 * CMS—Content Management System
 * CN—Canonical Name
 * CN—Common Name
 * CNC—Computer Numerical Control
 * CNG—Cryptographic Next Generation
 * CNG—Cryptography Next Generation
 * CNR—Communications and Networking Riser
 * COBOL—Common Business-Oriented Language
 * COM—Component Object Model or communication
 * CORBA—Common Object Request Broker Architecture
 * CORS—Cross-Origin Resource Sharing
 * COTS—Commercial Off-The-Shelf
 * CPA—Cell Processor Architecture
 * CPAN—Comprehensive Perl Archive Network
 * CP/M—Control Program/Monitor
 * CPRI—Common Public Radio Interface
 * CPS—characters per second
 * CPU—Central Processing Unit
 * CQS—Command–query separation
 * CQRS—Command Query Responsibility Segregation
 * CR—Carriage Return
 * CRAN—Comprehensive R Archive Network
 * CRC—Cyclic Redundancy Check
 * CRLF—Carriage Return Line Feeds
 * CRM—Customer Relationship Management
 * CRS—Computer Reservations System
 * CRT—Cathode-Ray Tube
 * CRUD—Create, Read, Update and Delete
 * CS—Cable Select
 * CS—Computer Science
 * CSE—Computer Science and Engineering
 * CSI—Common System Interface
 * CSM—Compatibility Support Module
 * CSMA/CD—Carrier-sense multiple access with collision detection
 * CSP—Cloud Service Provider
 * CSP—Communicating Sequential Processes
 * CSRF—Cross-Site Request Forgery
 * CSS—Cascading Style Sheets
 * CSS—Content-Scrambling System
 * CSS—Closed Source Software
 * CSS—Cross-Site Scripting
 * CSV—Comma-Separated Values
 * CT—Computerized Tomography
 * CTAN—Comprehensive TeX Archive Network
 * CTCP—Client-To-Client Protocol
 * CTI—Computer Telephony Integration
 * CTFE—Compile-time function execution
 * CTL—Computational Tree Logic
 * CTM—Close To Metal
 * CTS—Clear To Send
 * CTSS—Compatible Time-Sharing System
 * CUA—Common User Access
 * CVE—Common Vulnerabilities and Exposures
 * CVS—Concurrent Versioning System
 * CX—Customer Experience

D

 * DAC—Digital-To-Analog Converter
 * DAC—Discretionary Access Control
 * DAL—Database Abstraction Layer
 * DAO—Data Access Object
 * DAO—Data Access Objects
 * DAO—Disk-At-Once
 * DAP—Directory Access Protocol
 * DARPA—Defense Advanced Research Projects Agency
 * DAS—Direct Attached Storage
 * DAT—Digital Audio Tape
 * DB—Database
 * DSKT—Desktop
 * DBA—Database Administrator
 * DBCS—Double Byte Character Set
 * DBMS—Database Management System
 * DCC—Direct Client-to-Client
 * DCCP—Datagram Congestion Control Protocol
 * DCCA—Debian Common Core Alliance
 * DCL—Data Control Language
 * DCS—Distributed Control System
 * DCMI—Dublin Core Metadata Initiative
 * DCOM—Distributed Component Object Model
 * DD—Double Density
 * DDE—Dynamic Data Exchange
 * DDI—DNS DHCP & IP address management
 * DDL—Data Definition Language
 * DDoS—Distributed Denial of Service
 * DDR—Double Data Rate
 * DEC—Digital Equipment Corporation
 * DES—Data Encryption Standard
 * dev—development
 * DFA—Deterministic Finite Automaton
 * DFD—Data Flow Diagram
 * DFS—Depth-First Search
 * DFS—Distributed File System
 * DGD—Dworkin's Game Driver
 * DHCP—Dynamic Host Configuration Protocol
 * DHTML—Dynamic Hypertext Markup Language
 * DIF—Data Integrity Field
 * DIMM—Dual Inline Memory Module
 * DIN—Deutsches Institut für Normung
 * DIP—Dual In-line Package
 * DISM—Deployment Image and Service Management Tool
 * DIVX—Digital Video Express
 * DKIM—Domain Keys Identified Mail
 * DL—Download
 * DLL—Dynamic Link Library
 * DLNA—Digital Living Network Alliance
 * DMA—Direct Memory Access
 * DMCA—Digital Millennium Copyright Act
 * DMI—Direct Media Interface
 * DML—Data Manipulation Language
 * DML—Definitive Media Library
 * DMR—Dennis M. Ritchie
 * DMZ—Demilitarized Zone
 * DN—Distinguished Name
 * DND—Drag-and-Drop
 * DNS—Domain Name System
 * DOA—Dead on Arrival
 * DOCSIS—Data Over Cable Service Interface Specification
 * DOM—Document Object Model
 * DORA—Discover, Offer, Request, Acknowledge
 * DoS—Denial of Service
 * DOS—Disk Operating System
 * DP—Dot Pitch
 * DPC—Deferred Procedure Call
 * DPI—Deep Packet Inspection
 * DPI—Dots Per Inch
 * DPMI—DOS Protected Mode Interface
 * DPMS—Display Power Management Signaling
 * DR—Disaster Recovery
 * DRAM—Dynamic Random-Access Memory
 * DR-DOS—Digital Research – Disk Operating System
 * DRI—Direct Rendering Infrastructure
 * DRM—Digital Rights Management
 * DRM—Direct Rendering Manager
 * DSA—Digital Signature Algorithm
 * DSDL—Document Schema Definition Languages
 * DSDM—Dynamic Systems Development Method
 * DSL—Digital Subscriber Line
 * DSL—Domain-Specific Language
 * DSLAM—Digital Subscriber Line Access Multiplexer
 * DSN—Database Source Name
 * DSN—Data Set Name
 * DSP—Digital Signal Processor
 * DSSSL—Document Style Semantics and Specification Language
 * DTD—Document Type Definition
 * DTE—Data Terminal Equipment or data transfer rate
 * DTO—Data Transfer Object
 * DTP—Desktop Publishing
 * DTR—Data Terminal Ready or Data transfer rate
 * DVD—Digital Versatile Disc or Digital Video Disc
 * DVD-R—DVD-Recordable
 * DVD-ROM—DVD-Read-Only Memory
 * DVD-RW—DVD-Rewritable
 * DVI—Digital Visual Interface
 * DVR—Digital Video Recorder
 * DW—Data Warehouse

E

 * EAI—Enterprise Application Integration
 * EAP—Extensible Authentication Protocol
 * EAS—Exchange ActiveSync
 * EBCDIC—Extended Binary Coded Decimal Interchange Code
 * EBML—Extensible Binary Meta Language
 * ECC—Elliptic Curve Cryptography
 * ECMA—European Computer Manufacturers Association
 * ECN—Explicit Congestion Notification
 * ECOS—Embedded Configurable Operating System
 * ECRS—Expense and Cost Recovery System
 * ECS—Entity-Component-System
 * EDA—Electronic Design Automation
 * EDGE—Enhanced Data rates for GSM Evolution
 * EDI—Electronic Data Interchange
 * EDO—Extended Data Out
 * EDSAC—Electronic Delay Storage Automatic Calculator
 * EDVAC—Electronic Discrete Variable Automatic Computer
 * EEPROM—Electronically Erasable Programmable Read-Only Memory
 * EFF—Electronic Frontier Foundation
 * EFI—Extensible Firmware Interface
 * EFM—Eight-to-Fourteen Modulation
 * EFM—Ethernet in the First Mile
 * EFS—Encrypting File System
 * EGA—Enhanced Graphics Array
 * E-mail—Electronic mail
 * EGP—Exterior Gateway Protocol
 * eID—electronic ID card
 * EIDE—Enhanced IDE
 * EIGRP—Enhanced Interior Gateway Routing Protocol
 * EISA—Extended Industry Standard Architecture
 * ELF—Extremely Low Frequency
 * ELF—Executable and Linkable Format
 * ELM—ELectronic Mail
 * EMACS—Editor MACroS
 * EMS—Expanded Memory Specification
 * ENIAC—Electronic Numerical Integrator And Computer
 * EOD—End of Day
 * EOF—End of File
 * EOL—End of Life
 * EOL—End of Line
 * EOM—End of Message
 * EOS—End of Support
 * EPIC—Explicitly Parallel Instruction Computing
 * EPROM—Erasable Programmable Read-Only Memory
 * ERD—Entity–Relationship Diagram
 * ERM—Entity–Relationship Model
 * ERP—Enterprise Resource Planning
 * eSATA—external SATA
 * ESB—Enterprise service bus
 * ESCON—Enterprise Systems Connection
 * ESD—Electrostatic Discharge
 * ESI—Electronically Stored Information
 * ESR—Eric Steven Raymond
 * ETL—Extract, Transform, Load
 * ETW—Event Tracing for Windows
 * EUC—Extended Unix Code
 * EULA—End User License Agreement
 * EWM—Enterprise Work Management
 * EWMH—Extended Window Manager Hints
 * EXT—EXTended file system
 * ETA—Estimated Time of Arrival

F

 * FAP—FORTRAN Assembly Program
 * FASM—Flat ASseMbler
 * FAT—File Allocation Table
 * FAQ—Frequently Asked Questions
 * FBDIMM—Fully Buffered Dual Inline Memory Module
 * FC-AL—Fibre Channel Arbitrated Loop
 * FCB—File Control Block
 * FCS—Frame Check Sequence
 * FDC—Floppy-Disk Controller
 * FDS—Fedora Directory Server
 * FDD—Frequency-Division Duplexing
 * FDD—Floppy Disk Drive
 * FDDI—Fiber Distributed Data Interface
 * FDM—Frequency-Division Multiplexing
 * FDMA—Frequency-Division Multiple Access
 * FE—Frontend
 * FEC—Forward Error Correction
 * FEMB—Front-End Motherboard
 * FET—Field Effect Transistor
 * FHS—Filesystem Hierarchy Standard
 * FICON—FIber CONnectivity
 * FIFO—First In First Out
 * FIPS—Federal Information Processing Standards
 * FL—Function Level
 * FLAC—Free Lossless Audio Codec
 * FLOPS—FLoating-Point Operations Per Second
 * FLOSS—Free/Libre/Open-Source Software
 * FMC—Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
 * FMO—Future Mode of Operation
 * FOLDOC—Free On-line Dictionary of Computing
 * FORTRAN—Formula Translation
 * FOSDEM—Free and Open-source Software Developers' European Meeting
 * FOSI—Formatted Output Specification Instance
 * FOSS—Free and Open-Source Software
 * FP—Function Programming
 * FP—Functional Programming
 * FPGA—Field Programmable Gate Array
 * FPS—Floating Point Systems
 * FPU—Floating-Point Unit
 * FRU—Field-Replaceable Unit
 * FS—File System
 * FSB—Front-Side Bus
 * fsck—File System Check
 * FSF—Free Software Foundation
 * FSM—Finite State Machine
 * FTTA—Fiber To The Antenna
 * FTTC—Fiber To The Curb
 * FTTH—Fiber To The Home
 * FTTP—Fiber To The Premises
 * FTP—File Transfer Protocol
 * FQDN—Fully Qualified Domain Name
 * FUD—Fear Uncertainty Doubt
 * FWS—Folding White Space
 * FXP—File eXchange Protocol
 * FYI—For Your Information
 * FVEK—Full Volume Encryption Key

G

 * G11N—Globalization
 * Gas—GNU Assembler
 * Gb—Gigabit
 * GB—Gigabyte
 * Gbps—Gigabits per second
 * GCC—GNU Compiler Collection
 * GCJ—GNU Compiler for Java
 * GCP—Google Cloud Platform
 * GCR—Group Coded Recording
 * GDB—GNU Debugger
 * GDI—Graphics Device Interface
 * GFDL—GNU Free Documentation License
 * GIF—Graphics Interchange Format
 * GIGO—Garbage In, Garbage Out
 * GIMP—GNU Image Manipulation Program
 * GIMPS—Great Internet Mersenne Prime Search
 * GIS—Geographic Information System
 * GLUT—OpenGL Utility Toolkit
 * GML—Geography Markup Language
 * GNOME—GNU Network Object Model Environment
 * GNU—GNU's Not Unix
 * GOMS—Goals, Operators, Methods, and Selection rules
 * GPASM—GNU PIC ASseMbler
 * GPFS—General Parallel File System
 * GPG—GNU Privacy Guard
 * GPGPU—General-Purpose Computing on Graphics Processing Units
 * GPIB—General-Purpose Instrumentation Bus
 * GPL—General Public License
 * GPL—General-Purpose Language
 * GPRS—General Packet Radio Service
 * GPT—GUID Partition Table
 * GPU—Graphics Processing Unit
 * GRUB—Grand Unified Boot-Loader
 * GERAN—GSM EDGE Radio Access Network
 * GSM—Global System for Mobile Communications
 * GTK/GTK+—GIMP Toolkit
 * GUI—Graphical User Interface
 * GUID—Globally Unique IDentifier
 * GWT—Google Web Toolkit
 * GYR—IT Networking

H

 * HA—High availability
 * HAL—Hardware Abstraction Layer
 * HARD—HTML Application Rapid Development
 * HASP—Houston Automatic Spooling Priority
 * HBA—Host Bus Adapter
 * HCI—Human—Computer Interaction
 * HD—High Density
 * HDD—Hard Disk Drive
 * HCL—Hardware Compatibility List
 * HD DVD—High Definition DVD
 * HDL—Hardware Description Language
 * HDMI—High-Definition Multimedia Interface
 * HECI—Host Embedded Controller Interface
 * HF—High Frequency
 * HFS—Hierarchical File System
 * HHD—Hybrid Hard Drive
 * HID—Human Interface Device
 * HIG—Human Interface Guidelines
 * HIRD—Hurd of Interfaces Representing Depth
 * HLASM—High Level ASseMbler
 * HLS—HTTP Live Streaming
 * HMA—High Memory Area
 * HP—Hewlett-Packard
 * HPC—High-Performance Computing
 * HPFS—High Performance File System
 * HSDPA—High-Speed Downlink Packet Access
 * HTC—High-Throughput Computing
 * HSM—Hierarchical Storage Management
 * HT—Hyper Threading
 * HTM—Hierarchical Temporal Memory
 * HTML—Hypertext Markup Language
 * HTTP—Hypertext Transfer Protocol
 * HTTPd—Hypertext Transport Protocol Daemon
 * HTTPS—HTTP Secure
 * HTX—HyperTransport eXpansion
 * HURD—Hird of Unix-Replacing Daemons
 * HVD—Holographic Versatile Disc
 * Hz—Hertz

I

 * I²C—Inter-Integrated Circuit
 * I²S—Integrated Interchip Sound
 * I18N—Internationalization
 * IANA—Internet Assigned Numbers Authority
 * IaaS—Infrastructure as a Service
 * IaC—Infrastructure as Code
 * iBCS—Intel Binary Compatibility Standard
 * IBM—International Business Machines
 * IC—Integrated Circuit
 * ICANN—Internet Corporation for Assigned Names and Numbers
 * ICE—In-Circuit Emulator
 * ICE—Intrusion Countermeasure Electronics
 * ICH—I/O Controller Hub
 * ICMP—Internet Control Message Protocol
 * ICP—Internet Cache Protocol
 * ICS—Internet Connection Sharing
 * ICT—Information and Communication Technology
 * IDE—Integrated Development Environment
 * IDE—Integrated Drive Electronics
 * IDF—Intermediate Distribution Frame
 * IDF—Intermediate Data Format
 * IDL—Interactive Data Language
 * IDL—Interface Definition Language
 * IdP—Identity Provider (cybersecurity)
 * IDS—Intrusion Detection System
 * IE—Internet Explorer
 * IEC—International Electrotechnical Commission
 * IEEE—Institute of Electrical and Electronics Engineers
 * IETF—Internet Engineering Task Force
 * IFL—Integrated Facility for Linux
 * IGMP—Internet Group Management Protocol
 * IGRP—Interior Gateway Routing Protocol
 * IHV—Independent Hardware Vendor
 * IIOP—Internet Inter-Orb Protocol
 * IIS—Internet Information Services
 * IKE—Internet Key Exchange
 * IL—Intermediate Language
 * IM—Instant Message or Instant Messaging
 * IMAP—Internet Message Access Protocol
 * IME—Input Method Editor
 * INFOSEC—Information Systems Security
 * I/O—Input/output
 * IoT—Internet of Things
 * IP—Intellectual Property
 * IP—Internet Protocol
 * IPAM—IP Address Management
 * IPC—Inter-Process Communication
 * IPL—Initial Program Load
 * IPMI—Intelligent Platform Management Interface
 * IPO—Inter Procedural Optimization
 * IPP—Internet Printing Protocol
 * IPS—In-Plane Switching
 * IPS—Instructions Per Second
 * IPS—Intrusion Prevention System
 * IPsec—Internet Protocol security
 * IPTV—Internet Protocol Television
 * IPv4—Internet Protocol version 4
 * IPv6—Internet Protocol version 6
 * IPX—Internetwork Packet Exchange
 * IR—Intermediate Representation
 * IRC—Internet Relay Chat
 * IrDA—Infrared Data Association
 * IRI—Internationalized Resource Identifier
 * IRP—I/O Request Packet
 * IRQ—Interrupt Request
 * IS—Information Systems
 * IS-IS—Intermediate System to Intermediate System
 * ISA—Industry Standard Architecture
 * ISA—Instruction Set Architecture
 * ISAM—Indexed Sequential Access Method
 * ISATAP—Intra-Site Automatic Tunnel Addressing Protocol
 * ISC—Internet Storm Center
 * iSCSI—Internet Small Computer System Interface
 * ISDN—Integrated Services Digital Network
 * ISO—International Organization for Standardization
 * iSNS—Internet Storage Name Service
 * ISP—Internet Service Provider
 * ISPF—Interactive System Productivity Facility
 * ISR—Interrupt Service Routine
 * ISV—Independent Software Vendor
 * IT—Information Technology
 * ITIL—Information Technology Infrastructure Library
 * ITL—Interval Temporal Logic
 * ITU—International Telecommunication Union
 * IVR(S)—Interactive Voice Response (System)

J

 * J2EE—Java 2 Enterprise Edition
 * J2ME—Java 2 Micro Edition
 * J2SE—Java 2 Standard Edition
 * JAXB—Java Architecture for XML Binding
 * JAX-RPC—Jakarta XML (formerly Java XML) for Remote Procedure Calls
 * JAXP—Java API for XML Processing
 * JBOD—Just a Bunch of Disks
 * JCE— Java Cryptography Extension
 * JCL—Job Control Language
 * JCP—Java Community Process
 * JDBC—Java Database Connectivity
 * JDK—Java Development Kit
 * JEE—Java Enterprise Edition
 * JES—Job Entry Subsystem
 * JDS—Java Desktop System
 * JFC—Java Foundation Classes
 * JFET—Junction Field-Effect Transistor
 * JFS—IBM Journaling File System
 * JINI—Jini Is Not Initials
 * JIT—Just-In-Time
 * JME—Java Micro Edition
 * JMX—Java Management Extensions
 * JMS—Java Message Service
 * JNDI—Java Naming and Directory Interface
 * JNI—Java Native Interface
 * JNZ—Jump non-zero
 * JPEG—Joint Photographic Experts Group
 * JRE—Java Runtime Environment
 * JS—JavaScript
 * JSE—Java Standard Edition
 * JSON—JavaScript Object Notation
 * JSP—Jackson Structured Programming
 * JSP—JavaServer Pages
 * JTAG—Joint Test Action Group
 * JVM—Java Virtual Machine

K

 * K&R—Kernighan and Ritchie
 * K8s—Kubernetes
 * KB—Keyboard
 * Kb—Kilobit
 * KB—Kilobyte
 * KB—Knowledge Base
 * Kbps—Kilobits per second
 * KiB—Kibibyte
 * KDE—K Desktop Environment
 * kHz—Kilohertz
 * KM—Knowledge Machine
 * KRL—Knowledge Representation Language
 * KVM—Keyboard, Video, Mouse

L

 * L10N—Localization
 * L2TP—Layer two Tunneling Protocol
 * LACP—Link Aggregation Control Protocol
 * LAMP—Linux Apache MySQL Perl
 * LAMP—Linux Apache MySQL PHP
 * LAMP—Linux Apache MySQL Python
 * LAN—Local Area Network
 * LBA—Logical Block Addressing
 * LB—Load Balancer
 * LCD—Liquid Crystal Display
 * LCR—Least Cost Routing
 * LCOS—Liquid Crystal On Silicon
 * LDAP—Lightweight Directory Access Protocol
 * LE—Logical Extents
 * LED—Light-Emitting Diode
 * LF—Line Feed
 * LF—Low Frequency
 * LFS—Linux From Scratch
 * LGA—Land Grid Array
 * LGPL—Lesser General Public License
 * LIB—LIBrary
 * LIF—Low Insertion Force
 * LIFO—Last In First Out
 * LILO—Linux Loader
 * LIP—Loop Initialization Primitive
 * LISP—LISt Processing
 * LKML—Linux Kernel Mailing List
 * LM—Lan Manager
 * LOC—Lines of Code
 * LPC—Lars Pensjö C
 * LPI—Lines Per Inch
 * LPI—Linux Professional Institute
 * LPT— Line Print Terminal
 * LRU—Least Recently Used
 * LSB—Least Significant Bit
 * LSB—Linux Standard Base
 * LSI—Large-Scale Integration
 * LTE—Long Term Evolution
 * LTL—Linear Temporal Logic
 * LTR—Left-to-Right
 * LUG—Linux User Group
 * LUN—Logical Unit Number
 * LV—Logical Volume
 * LVD—Low Voltage Differential
 * LVM—Logical Volume Management
 * LZW—Lempel-Ziv-Welch

M

 * MAC—Mandatory Access Control
 * MAC—Media Access Control
 * MAC—Message authentication code
 * MANET—Mobile Ad-Hoc Network
 * MAN—Metropolitan Area Network
 * MAPI—Messaging Application Programming Interface
 * MBCS—Multi Byte Character Set
 * MBD—Model-Based Design
 * MBR—Master Boot Record
 * Mb—Megabit
 * MB—Megabyte
 * Mbps—Megabits per second
 * MCAD—Microsoft Certified Application Developer
 * MCAS—Microsoft Certified Application Specialist
 * MCA—Micro Channel Architecture
 * MCA—Microsoft Certified Architect
 * MCDBA—Microsoft Certified DataBase Administrator
 * MCDST—Microsoft Certified Desktop Support Technician
 * MCITP—Microsoft Certified Information Technology Professional
 * MCM—Microsoft Certified Master
 * MCPC—Multiple Channels Per Carrier
 * MCPD—Microsoft Certified Professional Developer
 * MCP—Microsoft Certified Professional
 * MCSA—Microsoft Certified Systems Administrator
 * MCSD—Microsoft Certified Solution Developer
 * MCSE—Microsoft Certified Systems Engineer
 * MCTS—Microsoft Certified Technology Specialist
 * MCT—Microsoft Certified Trainer
 * MDA—Monochrome Display Adapter
 * MDA—Mail Delivery Agent
 * MDA—Model-Driven Architecture
 * MDD/MDSD—Model-Driven (Software) Development
 * MDF—Main Distribution Frame
 * MDI—Multiple-Document Interface
 * MDM—Master Data Management
 * ME—Microsoft Edge
 * ME—[Windows] Millennium Edition
 * MFA—Multi-factor authentication
 * MFC—Microsoft Foundation Classes
 * MFT—Master File Table
 * MFM—Modified Frequency Modulation
 * MF—Medium Frequency
 * MGCP—Media Gateway Control Protocol
 * MHz—Megahertz
 * MIB—Management Information Base
 * MICR—Magnetic Ink Character Recognition or Magnetic Ink Character Reader
 * MIDI—Musical Instrument Digital Interface
 * MIMD—Multiple Instruction, Multiple Data
 * MIME—Multipurpose Internet Mail Extensions
 * MIMO—Multiple-Input Multiple-Output
 * MINIX—MIni-uNIX
 * MIPS—Microprocessor without Interlocked Pipeline Stages
 * MIPS—Million Instructions Per Second
 * MISD—Multiple Instruction, Single Data
 * MIS—Management Information Systems
 * MIT—Massachusetts Institute of Technology
 * ML—Machine Learning
 * MMC—Microsoft Management Console
 * MMDS—Mortality Medical Data System
 * MMDS—Multichannel Multipoint Distribution Service
 * MMF—Multi-Mode (optical) Fiber
 * MMIO—Memory-Mapped I/O
 * MMI—Man Machine Interface.
 * MMORPG—Massively Multiplayer Online Role-Playing Game
 * MMS—Multimedia Message Service
 * MMU—Memory Management Unit
 * MMX—Multi-Media Extensions
 * MNG—Multiple-image Network Graphics
 * MoBo—Motherboard
 * MOM—Message-Oriented Middleware
 * MOO—MUD Object Oriented
 * MOP—Meta-Object Protocol
 * MOSFET—Metal-Oxide Semiconductor Field Effect Transistor
 * MOS—Microsoft Office Specialist
 * MOTD—Message Of The Day
 * MOUS—Microsoft Office User Specialist
 * MOV—Apple QuickTime Multimedia File
 * MPAA—Motion Picture Association of America
 * MPEG—Motion Pictures Experts Group
 * MPLS—Multiprotocol Label Switching
 * MPL—Mozilla Public License
 * MPU—Microprocessor Unit
 * MS-DOS—Microsoft DOS
 * MSA—Mail Submission Agent
 * MSB—Most Significant Bit
 * MSDN—Microsoft Developer Network
 * MSI—Medium-Scale Integration
 * MSI—Message Signaled Interrupt
 * MSI—Microsoft Installer
 * MSN—Microsoft Network
 * MS—Microsoft
 * MS—Memory Stick
 * MTA—Mail Transfer Agent
 * MTA—Microsoft Technology Associate
 * MTBF—Mean Time Between Failures
 * MTU—Maximum Transmission Unit
 * MT—Machine Translation
 * MUA—Mail User Agent
 * MUD—Multi-User Dungeon
 * MU—Memory Unit
 * MVC—Model-View-Controller
 * MVP—Most Valuable Professional
 * MVS—Multiple Virtual Storage
 * MWC—Mobile World Congress
 * MXF—Material Exchange Format
 * MX—Mail exchange

N

 * NAC—Network Access Control
 * NACK—Negative ACKnowledgement
 * NAK—Negative AcKnowledge Character
 * NaN—Not a Number
 * NAP—Network Access Protection
 * NAS—Network-Attached Storage
 * NASM—Netwide ASseMbler
 * NAT—Network Address Translation
 * NCP—NetWare Core Protocol
 * NCQ—Native Command Queuing
 * NCSA—National Center for Supercomputing Applications
 * NDIS—Network Driver Interface Specification
 * NDPS—Novell Distributed Print Services
 * NDS—Novell Directory Services
 * NEP—Network Equipment Provider
 * NetBIOS—Network Basic Input/Output System
 * NetBT—NetBIOS over TCP/IP
 * NEXT—Near-End CrossTalk
 * NFA—Nondeterministic Finite Automaton
 * NFC—Near-field communication
 * NFS—Network File System
 * NFT—Non-Fungible Token
 * NGL—aNGeL
 * NGSCB—Next-Generation Secure Computing Base
 * NI—National Instruments
 * NIC—Network Interface Controller or Network Interface Card
 * NIM—No Internal Message
 * NIO—Non-blocking I/O
 * NIST—National Institute of Standards and Technology
 * NLE—Non-Linear Editing system
 * NLP—Natural Language Processing
 * NLS—Native Language Support
 * NMI—Non-Maskable Interrupt
 * NNTP—Network News Transfer Protocol
 * NOC—Network Operations Center
 * NOP—No OPeration
 * NOS—Network Operating System
 * NP—Nondeterministic Polynomial time
 * NPL—Netscape Public License
 * NPTL—Native POSIX Thread Library
 * NPU—Network Processing Unit
 * NS—Netscape
 * NSA—Network Security Appliance
 * NSI—Network Service Interface
 * NSIS—Nullsoft Scriptable Install System
 * NSPR—Netscape Portable Runtime
 * NSS—Novell Storage Service
 * NSS—Network Security Services
 * NSS—Name Service Switch
 * NT—New Technology
 * NTFS—NT Filesystem
 * NTLM—NT Lan Manager
 * NTP—Network Time Protocol
 * NUMA—Non-Uniform Memory Access
 * NURBS—Non-Uniform Rational B-Spline
 * NVR—Network Video Recorder
 * NVRAM—Non-Volatile Random-Access Memory

O

 * OASIS—Organization for the Advancement of Structured Information Standards
 * OAT—Operational Acceptance Testing
 * OBSAI—Open Base Station Architecture Initiative
 * OCR—Optical Character Recognition
 * ODBC—Open Database Connectivity
 * OEM—Original Equipment Manufacturer
 * OES—Open Enterprise Server
 * OFDM—Orthogonal Frequency-Division Multiplexing
 * OFTC—Open and Free Technology Community
 * OID—Object Identifier
 * OLAP—Online Analytical Processing
 * OLE—Object Linking and Embedding
 * OLED—Organic Light Emitting Diode
 * OLPC—One Laptop per Child
 * OLTP—Online Transaction Processing
 * OMF—Object Module Format
 * OMG—Object Management Group
 * OMR—Optical Mark Reader
 * OO—Object-Oriented
 * OO—OpenOffice
 * OOE—Out-of-Order Execution
 * OOM—Out Of Memory
 * OOo—OpenOffice.org
 * OoOE—Out-of-Order Execution
 * OOP—Object-Oriented Programming
 * OOTB—Out of the box
 * OPML—Outline Processor Markup Language
 * ORB—Object Request Broker
 * ORM—Object–Relational Mapping
 * OS—Open Source
 * OS—Operating System
 * OSCON—O'Reilly Open Source CONvention
 * OSDN—Open Source Development Network
 * OSI—Open Source Initiative
 * OSI—Open Systems Interconnection
 * OSPF—Open Shortest Path First
 * OSS—Open Sound System
 * OSS—Open-Source Software
 * OSS—Operations Support System
 * OSTG—Open Source Technology Group
 * OTP—One-time password
 * OUI—Organizationally Unique Identifier

P

 * P2P—Peer-To-Peer
 * PaaS—Platform as a Service
 * PAM—Privileged Access Management
 * PAN—Personal Area Network
 * PAP—Password Authentication Protocol
 * PARC—Palo Alto Research Center
 * PATA—Parallel ATA
 * PBS—Portable Batch System
 * PC—Personal Computer
 * PCB—Printed Circuit Board
 * PCB—Process Control Block
 * PC DOS—Personal Computer Disc Operating System
 * PCI—Peripheral Component Interconnect
 * PCIe—PCI Express
 * PCI-X—PCI Extended
 * PCL—Printer Command Language
 * PCMCIA—Personal Computer Memory Card International Association
 * PCM—Pulse-Code Modulation
 * PCRE—Perl Compatible Regular Expressions
 * PD—Public Domain
 * PDA—Personal Digital Assistant
 * PDF—Portable Document Format
 * PDH—Plesiochronous Digital Hierarchy
 * PDP—Programmed Data Processor
 * PE—Physical Extents
 * PE—Portable Executable
 * PERL—Practical Extraction and Reporting Language
 * PFA—Please Find Attachment
 * PG—Peripheral Gateway
 * PGA—Pin Grid Array
 * PGA—Programmable Gate Array
 * PGO—Profile-Guided Optimization
 * PGP—Pretty Good Privacy
 * PHP—Hypertext Preprocessor
 * PIC—Peripheral Interface Controller
 * PIC—Programmable Interrupt Controller
 * PID—Proportional-Integral-Derivative
 * PID—Process ID
 * PIM—Personal Information Manager
 * PINE—Program for Internet News and Email
 * PIM—Platform Independent Model
 * PING—Packet Internet Gopher
 * PIO—Programmed Input/Output
 * Pixel—Picture element
 * PKCS—Public Key Cryptography Standards
 * PKI—Public Key Infrastructure
 * PLC—Power Line Communication
 * PLC—Programmable Logic Controller
 * PLD—Programmable Logic Device
 * PL/I—Programming Language One
 * PL/M—Programming Language for Microcomputers
 * PL/P—Programming Language for Prime
 * PLT—Power Line Telecommunications
 * PMM—POST Memory Manager
 * PNG—Portable Network Graphics
 * PnP—Plug-and-Play
 * PNRP—Peer Name Resolution Protocol
 * PoE—Power over Ethernet
 * PoS—Point of Sale
 * POCO—Plain Old Class Object
 * POID—Persistent Object Identifier
 * POJO—Plain Old Java Object
 * POP—Point of Presence
 * POP3—Post Office Protocol v3
 * POSIX—Portable Operating System Interface, formerly IEEE-IX
 * POST—Power-On Self Test
 * PPC—PowerPC
 * PPI—Pixels Per Inch
 * PPM—Pages Per Minute
 * PPP—Point-to-Point Protocol
 * PPPoA—PPP over ATM
 * PPPoE—PPP over Ethernet
 * PPTP—Point-to-Point Tunneling Protocol
 * PR—Pull Request
 * PROM—Programmable Read-Only Memory
 * PS—PostScript
 * PS/2—Personal System/2
 * PSA—Professional Services Automation
 * PSM—Platform Specific Model
 * PSTN—Public Switched Telephone Network
 * PSU—Power Supply Unit
 * PSVI—Post-Schema-Validation Infoset
 * PTS-DOS—PhysTechSoft – Disk Operating System
 * PV—Physical Volume
 * PVG—Physical Volume Group
 * PVR—Personal Video Recorder
 * PXE—Preboot Execution Environment
 * PXI—PCI eXtensions for Instrumentation
 * PRC—Procedure Remote Call

Q

 * QDR—Quad Data Rate
 * QA—Quality Assurance
 * QFP—Quad Flat Package
 * QoS—Quality of Service
 * QOTD—Quote of the Day
 * Qt—Quasar Toolkit
 * QTAM—Queued Teleprocessing Access Method
 * QSOP—Quarter Small Outline Package
 * qWave—Quality Windows Audio/Video Experience

R

 * RACF—Resource Access Control Facility
 * RAD—Rapid Application Development
 * RADIUS—Remote Authentication Dial In User Service
 * RAID—Redundant Array of Independent Disks
 * RAII—Resource Acquisition Is Initialization
 * RAIT—Redundant Array of Inexpensive Tapes
 * RAM—Random-Access Memory
 * RARP—Reverse Address Resolution Protocol
 * RAS—Reliability, Availability and Serviceability
 * RAS—Remote access service
 * RC—Region Code
 * RC—Release Candidate
 * RC—Run Commands
 * RCA—Root Cause Analysis
 * RCS—Revision Control System
 * RD—Remote Desktop
 * rd—remove directory
 * RDBMS—Relational Database Management System
 * RDC—Remote Desktop Connection
 * RDF—Resource Description Framework
 * RDM—Relational Data Model
 * RDOS—Real-time Disk Operating System
 * RDP—Remote Desktop Protocol
 * RDS—Remote Data Services
 * REFAL—Recursive Functions Algorithmic Language
 * REP—RAID Error Propagation
 * REST—Representational State Transfer
 * RESV—Reservation Message
 * regex—Regular Expression
 * regexp—Regular Expression
 * RF—Radio Frequency
 * RFC—Request For Comments
 * RFI—Radio Frequency Interference
 * RFID—Radio Frequency Identification
 * RGB—Red, Green, Blue
 * RGBA—Red, Green, Blue, Alpha
 * RHL—Red Hat Linux
 * RHEL—Red Hat Enterprise Linux
 * RIA—Rich Internet Application
 * RIAA—Recording Industry Association of America
 * RIP—Raster Image Processor
 * RIP—Routing Information Protocol
 * RIR—Regional Internet registry
 * RISC—Reduced Instruction Set Computer
 * RISC OS—Reduced Instruction Set Computer Operating System
 * RJE—Remote Job Entry
 * RLE—Run-Length Encoding
 * RLL—Run-Length Limited
 * rmdir—remove directory
 * RMI—Remote Method Invocation
 * RMS—Richard Matthew Stallman
 * ROM—Read-Only Memory
 * ROMB—Read-Out Motherboard
 * ROM-DOS—Read-Only Memory – Disk Operating System
 * RPA—Robotic Process Automation
 * RPC—Remote Procedure Call
 * RPG—Report Program Generator
 * RPM—RPM Package Manager
 * RRAS—Routing and Remote Access Service
 * RSA—Rivest Shamir Adleman
 * RSI—Repetitive Strain Injury
 * RSS—Radio Service Software
 * RSS—Rich Site Summary, RDF Site Summary, or Really Simple Syndication
 * RSVP—Resource Reservation Protocol
 * RTAI—Real-Time Application Interface
 * RTC—Real-Time Clock
 * RTE—Real-Time Enterprise
 * RTEMS—Real-Time Executive for Multiprocessor Systems
 * RTF—Rich Text Format
 * RTL—Right-to-Left
 * RTMP—Real Time Messaging Protocol
 * RTOS—Real-Time Operating System
 * RTP—Real-time Transport Protocol
 * RTS—Ready To Send
 * RTSP—Real Time Streaming Protocol
 * RTTI—Run-time Type Information
 * RTU—Remote Terminal Unit
 * RWD—Responsive Web Design

S

 * SaaS—Software as a Service
 * SASS—Syntactically Awesome Style Sheets
 * SAM—Security Account Manager
 * SAN—Storage Area Network
 * SAS—Serial attached SCSI
 * SATA—Serial ATA
 * SAX—Simple API for XML
 * SBOD—Spinning Beachball of Death
 * SBP-2—Serial Bus Protocol 2
 * sbin—superuser binary
 * sbs—Small Business Server
 * SBU—Standard Build Unit
 * SCADA—Supervisory Control And Data Acquisition
 * SCID—Source Code in Database
 * SCM—Software Configuration Management
 * SCM—Source Code Management
 * SCP—Secure Copy
 * SCPC—Single Channel Per Carrier
 * SCPI—Standard Commands for Programmable Instrumentation
 * SCSA—Secure Content Storage Association
 * SCSI—Small Computer System Interface
 * SCTP—Stream Control Transmission Protocol
 * SD—Secure Digital
 * SDDL—Security Descriptor Definition Language
 * SDH—Synchronous Digital Hierarchy
 * SDI—Single-Document Interface
 * SEC—Single Edge Contact
 * SDIO—Secure Digital Input Output
 * SDK—Software Development Kit
 * SDL—Simple DirectMedia Layer
 * SDN—Service Delivery Network
 * SDP—Session Description Protocol
 * SDR—Software-Defined Radio
 * SDRAM—Synchronous Dynamic Random-Access Memory
 * SDSL—Symmetric DSL
 * SE—Single Ended
 * SEI—Software Engineering Institute
 * SEO—Search Engine Optimization
 * SFTP—Secure FTP
 * SFTP—Simple File Transfer Protocol
 * SFTP—SSH File Transfer Protocol
 * SGI—Silicon Graphics, Incorporated
 * SGML—Standard Generalized Markup Language
 * SGR—Select Graphic Rendition
 * SHA—Secure Hash Algorithm
 * SHDSL—Single-pair High-speed Digital Subscriber Line
 * SIEM—Security information and event management
 * SIGCAT—Special Interest Group on CD-ROM Applications and Technology
 * SIGGRAPH—Special Interest Group on Graphics
 * SIMD—Single Instruction, Multiple Data
 * SIM—Subscriber Identification Module
 * SIMM—Single Inline Memory Module
 * SIP—Session Initiation Protocol
 * SIP—Supplementary Ideographic Plane
 * SISD—Single Instruction, Single Data
 * SISO—Single-Input and Single-Output
 * SLA—Service Level Agreement
 * SLED—SUSE Linux Enterprise Desktop
 * SLES—SUSE Linux Enterprise Server
 * SLI—Scalable Link Interface
 * SLIP—Serial Line Internet Protocol
 * SLM—Service Level Management
 * SLOC—Source Lines of Code
 * SME—Subject Matter Expert
 * SMF—Single-Mode (optical) Fiber
 * SPM—Software project management
 * SPMD—Single Program, Multiple Data
 * SPOF—Single point of failure
 * SMA—SubMiniature version A
 * SMB—Server Message Block
 * SMBIOS—System Management BIOS
 * SMIL—Synchronized Multimedia Integration Language
 * S/MIME—Secure/Multipurpose Internet Mail Extensions
 * SMP—Supplementary Multilingual Plane
 * SMP—Symmetric Multi-Processing
 * SMPS—Switch Mode Power Supply
 * SMS—Short Message Service
 * SMS—System Management Server
 * SMT—Simultaneous Multithreading
 * SMTP—Simple Mail Transfer Protocol
 * SNA—Systems Network Architecture
 * SNMP—Simple Network Management Protocol
 * SNTP—Simple Network Time Protocol
 * SOA—Service-Oriented Architecture
 * SOAP—Simple Object Access Protocol
 * SOAP—Symbolic Optimal Assembly Program
 * SOPA—Stop Online Piracy Act
 * SoC—System-on-a-Chip
 * SO-DIMM—Small Outline DIMM
 * SOE—Standard Operating Environment
 * SOHO—Small Office/Home Office
 * SOI—Silicon On Insulator
 * SOLID—Single-responsibility, Open-closed, Liskov substitution, Interface segregation, Dependency Inversion
 * SP—Service Pack
 * SPA—Single Page Application
 * SPF—Sender Policy Framework
 * SPI—Serial Peripheral Interface
 * SPI—Stateful Packet Inspection
 * SPARC—Scalable Processor Architecture
 * SQL—Structured Query Language
 * SRAM—Static Random-Access Memory
 * SSA—Static Single Assignment
 * SSD—Software Specification Document
 * SSD—Solid-State Drive
 * SSDP—Simple Service Discovery Protocol
 * SSE—Streaming SIMD Extensions
 * SSH—Secure Shell
 * SSI—Server Side Includes
 * SSI—Single-System Image
 * SSI—Small-Scale Integration
 * SSID—Service Set Identifier
 * SSL—Secure Socket Layer
 * SSO—Single Sign On
 * SSP—Supplementary Special-purpose Plane
 * SSR—Server Side Rendering
 * SSSE—Supplementary Streaming SIMD Extensions
 * SSSP—Single Source Shortest Path
 * SSTP—Secure Socket Tunneling Protocol
 * su—superuser
 * SUS—Single UNIX Specification
 * SUSE—Software und System-Entwicklung
 * SVC—Scalable Video Coding
 * SVG—Scalable Vector Graphics
 * SVGA—Super Video Graphics Array
 * SVD—Structured VLSI Design
 * SWF—Shock Wave Flash
 * SWT—Standard Widget Toolkit
 * Sysop—System operator

T

 * TAO—Track-At-Once
 * TAPI—Telephony Application Programming Interface
 * TASM—Turbo ASseMbler
 * TB—TeraByte
 * Tcl—Tool Command Language
 * TCP—Transmission Control Protocol
 * TCP/IP—Transmission Control Protocol/Internet Protocol
 * TCU—Telecommunication Control Unit
 * TDMA—Time-Division Multiple Access
 * TDP—Thermal Design Power
 * TFT—Thin-Film Transistor
 * TFTP—Trivial File Transfer Protocol
 * TI—Texas Instruments
 * TIFF—Tagged Image File Format
 * TLA—Three-Letter Acronym
 * TLD—Top-Level Domain
 * TLS—Thread-Local Storage
 * TLS—Transport Layer Security
 * TLV—Type—length—value
 * tmp—temporary
 * TNC—Terminal Node Controller
 * TNC—Threaded Neill-Concelman connector
 * TPF—Transaction Processing Facility
 * TPM—Trusted Platform Module
 * TROFF—Trace Off
 * TRON—Trace On
 * TRON—The Real-time Operating system Nucleus
 * TRSDOS—Tandy Radio Shack – Disk Operating System
 * TSO—Time Sharing Option
 * TSP—Traveling Salesman Problem
 * TSR—Terminate and Stay Resident
 * TTA—True Tap Audio
 * TTF—TrueType Font
 * TTL—Transistor—Transistor Logic
 * TTL—Time To Live
 * TTS—Text-to-Speech
 * TTY—Teletype
 * TUCOWS—The Ultimate Collection of Winsock Software
 * TUG—TeX Users Group
 * TWAIN—Technology Without An Interesting Name

U

 * UAAG—User Agent Accessibility Guidelines
 * UAC—User Account Control
 * UART—Universal Asynchronous Receiver/Transmitter
 * UAT—User Acceptance Testing
 * UB—Undefined Behavior
 * UCS—Universal Character Set
 * UDDI—Universal Description, Discovery, and Integration
 * UDMA—Ultra DMA
 * UDP—User Datagram Protocol
 * UEFI—Unified Extensible Firmware Interface
 * UHF—Ultra High Frequency
 * UI—User Interface
 * UL—Upload
 * ULA—Uncommitted Logic Array
 * ULSI—Ultra Large Scale Integration
 * UMA—Upper Memory Area
 * UMB—Upper Memory Block
 * UML—Unified Modeling Language
 * UML—User-Mode Linux
 * UMPC—Ultra-Mobile Personal Computer
 * UMTS—Universal Mobile Telecommunications System
 * UNC—Universal Naming Convention
 * UNIVAC—Universal Automatic Computer (By MKS)
 * UPS—Uninterruptible Power Supply or Uninterrupted Power Supply
 * URI—Uniform Resource Identifier
 * URL—Uniform Resource Locator
 * URN—Uniform Resource Name
 * USB—Universal Serial Bus
 * usr—User System Resources
 * USR—U.S. Robotics
 * UTC—Coordinated Universal Time
 * UTF—Unicode Transformation Format
 * UTP—Unshielded Twisted Pair
 * UTRAN—Universal Terrestrial Radio Access Network
 * UUCP—Unix to Unix Copy
 * UUID—Universally Unique Identifier
 * UUN—Universal User Name
 * UVC—Universal Virtual Computer
 * UWP—Universal Windows Platform
 * UX—User Experience

V

 * var—variable
 * VoLTE—Voice Over Long Term Evolution
 * VAX—Virtual Address eXtension
 * VCPI—Virtual Control Program Interface
 * VB—Visual Basic
 * VBA—Visual Basic for Applications
 * VBS—Visual Basic Script
 * VDI—Virtual Desktop Infrastructure
 * VDU—Visual Display Unit
 * VDM—Virtual DOS machine
 * VDSL—Very High Bitrate Digital Subscriber Line
 * VESA—Video Electronics Standards Association
 * VFAT—Virtual FAT
 * VHD—Virtual Hard Disk
 * VFS—Virtual File System
 * VG—Volume Group
 * VGA—Video Graphics Array
 * VHF—Very High Frequency
 * VIRUS—Vital Information Resource Under Seize
 * VLAN—Virtual Local Area Network
 * VLSM—Variable Length Subnet Mask
 * VLB—Vesa Local Bus
 * VLF—Very Low Frequency
 * VLIW—Very Long Instruction Word
 * VLSI—Very-Large-Scale Integration
 * VM—Virtual Machine
 * VM—Virtual Memory
 * VMM—Virtual Machine Monitor
 * VNC—Virtual Network Computing
 * VOD—Video On Demand
 * VoIP—Voice over Internet Protocol
 * VPN—Virtual Private Network
 * VPS—Virtual Private Server
 * VPU—Visual Processing Unit
 * VR—Virtual Reality
 * VRML—Virtual Reality Modeling Language
 * VSAM—Virtual Storage-Access Method
 * VSAT—Very Small Aperture Terminal
 * VT—Video Terminal
 * VTL—Virtual Tape Library
 * VTAM—Virtual Telecommunications Access Method
 * VRAM—Video Random-Access Memory

W

 * W3C—World Wide Web Consortium
 * WWDC—Apple World Wide Developer Conference
 * WAFS—Wide Area File Services
 * WAI—Web Accessibility Initiative
 * WAIS—Wide Area Information Server
 * WAN—Wide Area Network
 * WAP—Wireless Access Point
 * WAP—Wireless Application Protocol
 * WASM—Watcom ASseMbler
 * WBEM—Web-Based Enterprise Management
 * WCAG—Web Content Accessibility Guidelines
 * WCF—Windows Communication Foundation
 * WDM—Wavelength-Division Multiplexing
 * WebDAV—WWW Distributed Authoring and Versioning
 * WEP—Wired Equivalent Privacy
 * WFI—Wait For Interrupt
 * Wi-Fi—Wireless Fidelity
 * WiMAX—Worldwide Interoperability for Microwave Access
 * WinFS—Windows Future Storage
 * WinRT—Windows RunTime
 * WINS—Windows Internet Name Service
 * WLAN—Wireless Local Area Network
 * WMA—Windows Media Audio
 * WMI—Windows Management Instrumentation
 * WMV—Windows Media Video
 * WNS—Windows Push Notification Service
 * WOL—Wake-on-LAN
 * WOR—Wake-on-Ring
 * WORA—Write once, run anywhere
 * WORE—Write once, run everywhere
 * WORM—Write Once Read Many
 * WPA—Wi-Fi Protected Access
 * WPAD—Web Proxy Autodiscovery Protocol
 * WPAN—Wireless Personal Area Network
 * WPF—Windows Presentation Foundation
 * WS-D—Web Services-Discovery
 * WSDL—Web Services Description Language
 * WSFL—Web Services Flow Language
 * WUSB—Wireless Universal Serial Bus
 * WWAN—Wireless Wide Area Network
 * WWID—World Wide Identifier
 * WWN—World Wide Name
 * WWW—World Wide Web
 * WYSIWYG—What You See Is What You Get
 * WZC—Wireless Zero Configuration

X

 * XAG—XML Accessibility Guidelines
 * XAML—eXtensible Application Markup Language
 * XDM—X Window Display Manager
 * XDMCP—X Display Manager Control Protocol
 * XCBL—XML Common Business Library
 * XHTML—eXtensible Hypertext Markup Language
 * XILP—X Interactive ListProc
 * XML—eXtensible Markup Language
 * XMMS—X Multimedia System
 * XMPP—eXtensible Messaging and Presence Protocol
 * XMS—Extended Memory Specification
 * XNS—Xerox Network Systems
 * XP—Cross-Platform
 * XP—Extreme Programming
 * XPCOM—Cross Platform Component Object Model
 * XPI—XPInstall
 * XPIDL—Cross-Platform IDL
 * XPS—XML Paper Specification
 * XSD—XML Schema Definition
 * XSL—eXtensible Stylesheet Language
 * XSL-FO—eXtensible Stylesheet Language Formatting Objects
 * XSLT—eXtensible Stylesheet Language Transformations
 * XSS—Cross-Site Scripting
 * XTF—eXtensible Tag Framework
 * XTF—eXtended Triton Format
 * XUL—XML User Interface Language
 * XVGA—Extended Video Graphics Adapter

Y

 * Y2K—Year Two Thousand
 * Y2K38—Year Two Thousand Thirty Eight
 * YAAF—Yet Another Application Framework
 * YACC—Yet Another Compiler Compiler
 * YAGNI—You Aren't Gonna Need It
 * YAML—YAML Ain't Markup Language
 * YARN—Yet Another Resource Negotiator
 * YaST—Yet another Setup Tool

Z

 * ZCAV—Zone Constant Angular Velocity
 * ZCS—Zero Code Suppression
 * ZIF—Zero Insertion Force
 * ZIFS—Zero Insertion Force Socket
 * ZIP—ZIP file archive
 * ZISC—Zero Instruction Set Computer
 * ZOI—Zero One Infinity
 * ZOPE—Z Object Publishing Environment
 * ZMA—Zone Multicast Address
 * ZPL—Z-level Programming Language