List of acronyms: H

(Main list of acronyms)


 * h – (s) Hecto
 * H – (s) Henry – Hydrogen

HA

 * ha – (s) Hausa language (ISO 639-1 code) – Hectare
 * HA – (s) Haiti (FIPS 10-4 country code) – (i) High Availability
 * HAARP – (a) High Frequency Active Auroral Research Program
 * HAART – (a) Highly Active Anti-Retroviral Therapy
 * HAI – (i) Human Awareness Institute
 * HAL – (i) Hardware Abstraction Layer
 * HALO –
 * (a) Habitation and Logistics Outpost (of the planned Lunar Gateway space station)
 * High Altitude Low Opening (parachute jump)
 * HALT
 * (a) Highly Accelerated Life Test
 * (a) Hungry Angry Lonely Tired
 * HAMR – (a) Heat-assisted magnetic recording
 * HAN - (s) IATA code for Noi Bai International Airport
 * HANS – (a) Head And Neck Support (device used in many race cars)
 * HARM – (a) High-speed Anti-Radiation Missile
 * hat – (s) Haitian Creole language (ISO 639-2 code)
 * HAT – (i/a) Highest Astronomical Tide (nautical charts) – (a) Hungarian Automated Telescope
 * hau – (s) Hausa language (ISO 639-2 code)
 * HAW – (i) Heavy Antitank Weapon
 * HAWK – (a) Homing All the Way Killer (air defence system)
 * HAZ – (i) Heat-Affected Zone
 * HAZMAT – (p) Hazardous Materials

HB

 * HBCD – (p) HexaBromoCycloDodecane
 * HBCI – (i) Home Banking Computer Interface
 * HBCU – (i) Historically black colleges and universities (U.S.)
 * HBO – (i) Home Box Office
 * HBR – (i) Harvard Business Review
 * HBT – (i) Heterojunction Bipolar Transistor
 * HBV – (i) Hepatitis B Virus

HC

 * h.c. – (i) honoris causa (Latin, "for the sake of honor")
 * HCAL — (p) Homogeneous calorimeter
 * HCCI – (i) Homogeneous Charge Compression Ignition
 * HCF – (i) Highest Common Factor
 * HCI – (i) Human–Computer Interaction/Interface
 * HCPCS – (i) Health Care Procedure Coding System
 * HCSC – (i) Higher Command and Staff Course
 * HCT – (i) Higher Colleges of Technology, tertiary education institution in the United Arab Emirates (UAE)

HD

 * HD
 * (i) Henry Draper (star catalogue)
 * Hull-Down (armored vehicle target, as opposed to Fully Exposed)
 * High Definition
 * Huntington's Disease
 * HDD
 * (i) Hard Disk Drive
 * High-Density Disk
 * HDL – (i) High-Density Lipoprotein
 * HDM – (i) Human Decision-Making
 * HDMI – High-Definition Multimedia Interface
 * HDR
 * (i) Hard disk recorder
 * Henningson, Durham & Richardson (founders of the engineering and construction firm now known by their initials)
 * High dynamic range, a term used in both digital imaging and 3D rendering
 * Hot Dry Rock (experimental geothermal technology)
 * Human Development Report (UN publication)
 * HDRA – (i) Henry Doubleday Research Association
 * HDTV – (p) High-definition television

HE

 * he – (s) Hebrew language (ISO 639-1 code)
 * He – (s) Helium
 * HE – (a) High Explosive
 * HEAT – (a) High-Explosive Anti-Tank (ammunition)
 * heb – (s) Hebrew language (ISO 639-2 code)
 * HEBA – (p) Hellenic Basketball Clubs Association
 * HEER – (a) High-Explosive Extended Range (ammunition)
 * HEIC – (i) Honourable East India Company
 * HELOC – (a) Home equity line of credit
 * HEMP – (a) High-Altitude Electromagnetic Pulse
 * HEO
 * (a) High Earth orbit
 * (a) Highly elliptical orbit
 * HEOSS – (a) High Earth Orbit Space Surveillance
 * HEP – (i) High-Explosive Plastic (ammunition)
 * HEPA – (a/i) High-Efficiency Particulate Air (filter)
 * her – (s) Herero language (ISO 639-2 code)
 * HESH – (a) High-Explosive, Squash-Head (ammunition)
 * HESV – (i) Heavy Engineering Support Vehicle
 * HETT – (a) Heavy Equipment Transporting Truck / Heavy Equipment Truck Tractor
 * HEU – (i) Highly Enriched Uranium
 * HEV
 * Hybrid Electric Vehicle (non-rechargeable)
 * Hazadous EnVironment suit - outfit worn by Half-Life protagonist Gordon Freeman
 * Hewitts – (a) Hills in England, Wales and Ireland over Two Thousand feet (with topographic prominence of at least 30 m)

HF

 * Hf – (s) Hafnium
 * HF – (i) High Frequency
 * HFAC – (p) Human Factors ("aytchfak")
 * HFE – (i) Human Fertilisation and Embryology (UK Act)
 * HFE – (s) The common-emitter current gain in a BJT transistor (also represented by βF). See: BJT
 * HFEA – (i) Human Fertilisation and Embryology Authority (UK)

HG

 * Hg – (i) Mercury (Latin Hydrargyrum)
 * HGC – (i) UK Human Genetics Commission
 * HGF – (i) Human Growth Factor
 * HGTV – (i) Home & Garden Television

HH

 * HHD – (p) humanitatum doctor (Latin, "doctor of humanities")
 * HHB – Ha Ha Bonk – The noise made when you laugh your head off. Used instead of LOL...
 * HHS – (i) (U.S. Department of) Health and Human Services

HI

 * hi – (s) Hindi language (ISO 639-1 code)
 * HI – (s) Hawaii (postal symbol)
 * HIC – Hierarchical Ingredient Code, a system of classifying drug ingredients
 * HIDACZ – (p) High-Density Airspace Control Zone ("high dak zed/zee")
 * HIH – (i) His (or Her) Imperial Highness
 * HIIT - (a) High-Intensity Interval Training
 * HIM – (i) His (or Her) Imperial Majesty
 * HIMAD – (p) High to Medium Altitude Air Defence (see also H/MAD)
 * HIMARS - (a) HIgh Mobility Artillery Rocket System
 * HIMEZ – (a) High Altitude Missile Engagement Zone
 * HIMYM – How I Met Your Mother
 * hin – (s) Hindi language (ISO 639-2 code)
 * HIPAA – (i) U.S. Health Insurance Portability and Accountability Act
 * Hipparcos – (p) HIgh Precision Parallax COllecting Satellite
 * Hird – (a) Hurd of interfaces representing depth (cf. HURD)
 * HiRISE – (p) High Resolution Imaging Science Experiment
 * HIT – (a) Health Information Technology
 * HIV – (i) Human Immunodeficiency Virus
 * HIWT – (i) Hobart Institute of Welding Technology

HJ

 * HJ – (i) hic jacet (Latin, "here lies")
 * HJD – (i) Heliocentric Julian Day

HK

 * HK – (s) Hong Kong (ISO 3166 digram; FIPS 10-4 territory code)
 * HKD – (s) Hong Kong dollar (ISO 4217 currency code)
 * HKG –
 * (s) Hong Kong (ISO 3166 trigram)
 * Hong Kong International Airport (IATA code)
 * HKMAO – (i) Hong Kong and Macau Affairs Office
 * HKO – (i) Hong Kong Observatory
 * HKS – (i) HyperKinetic Syndrome
 * HKSAR – (i) Hong Kong Special Administrative Region of the People's Republic of China

HL

 * hL – (s) Hectolitre
 * HL
 * (i) Holding Line
 * (i) Half-Life
 * HLA – (i) High Level Architecture (simulation) – Human Leukocyte Antigen
 * HLL – (i) High-Level Language
 * HLN – (i) Headline News
 * HLOS – (i) High Level Output Specification
 * HLS – (i) hoc loco situs (Latin, "laid in this place")
 * HLVW – (i) Heavy Logistics Vehicle, Wheeled

HM

 * HM
 * (s) Heard Island and McDonald Islands (ISO 3166 digram; FIPS 10-4 territory code)
 * (i) His Majesty / Her Majesty (title for certain monarchs)
 * H/MAD – (p) High/Medium Altitude Air Defence ("aytchmad"; see also HIMAD)
 * HMCE – (i) Her/His Majesty's Customs and Excise (former UK government department; succeeded by HM Revenue and Customs)
 * HMCS
 * (i) Her/His Majesty's Canadian Ship
 * Her Majesty's Courts Service (former UK agency; succeeded by Her Majesty's Courts and Tribunals Service)
 * HMD
 * (s) Heard and McDonald Islands (ISO 3166 trigram)
 * (i) Helmet-Mounted Display
 * HMF – (p) HydroxyMethyl Furfural
 * HMICFRS - (i) His/Her Majesty's Inspectorate of Constabularies and of Fire and Rescue Services (UK Government agency)
 * HMM – (i) Hidden Markov model
 * HMMWV – (i) High Mobility Multipurpose Wheeled Vehicle ("hum-vee"; "hummer")
 * hmo – (s) Hiri Motu language (ISO 639-2 code)
 * HMO – (i) Health maintenance organization
 * HMO – (i) House in multiple occupation
 * HMO – (i) Human milk oligosaccharide
 * HMP – (i) Her Majesty's Prison
 * HMRC – (i) Her/His Majesty's Revenue and Customs
 * HMS - (i) Her/His Majesty's Ship (Royal Navy)
 * HMSO – (i) Her Majesty's Stationery Office
 * HMV – (i) His Master's Voice

HN

 * HN – (s) Honduras (ISO 3166 digram)
 * HND
 * (s) Honduras (ISO 3166 trigram)
 * Tokyo Haneda Airport (IATA code)
 * HNL
 * (s) Honduran lempira (ISO 4217 currency code)
 * Daniel K. Inouye International Airport (IATA code)

HO

 * ho – (s) Hiri Motu language (ISO 639-1 code)
 * Ho – (s) Holmium
 * HO – (s) Honduras (FIPS 10-4 country code)
 * HOLLAND – (a) Hope Our Love Lasts And Never Dies
 * HOMES – the Great Lakes; Huron, Ontario, Michigan, Erie, Superior
 * HONY – Humans of New York, a photoblog.
 * HOPI – (a) Hybrid Optical and Packet Infrastructure (see Internet2, Abilene Network)
 * HoReCa – (a) Hotel, Restaurant and Catering
 * HORIZON – (p) Hélicoptère d'observation radar et d'investigation sur zone (French, Zone Investigation and Radar Observation Helicopter)
 * HOSTAC – (a) Helicopter Operations from Ships Other Than Aircraft Carriers
 * HOT – (a) Highly Optimised Tolerance
 * HOTAS – (a) Hands on throttle-and-stick
 * HOTT or HotT – (i) Hordes of the Things (miniature fantasy wargaming rules; a play on The Lord of the Rings)
 * HOV – (i) High Occupancy Vehicle

HP

 * hp – (s) horse power
 * HP –
 * (i) Hewlett-Packard
 * Hindustan Petroleum
 * (s) Himachal Pradesh (Indian state code)
 * HPA – (i) UK Health Protection Agency
 * HPCL – (i) Hindustan Petroleum Corporation Limited
 * HPGL or HP-GL – (i) Hewlett-Packard Graphics Language
 * HPH - (s) IATA code for Cat Bi International Airport
 * HP-IB – (i) Hewlett-Packard Instrument/Interface Bus (first implementation of GP-IB, later standardised and now known as IEEE-488)
 * HP-IL – (i) Hewlett-Packard Interface Loop (serial bus used with some HP calculators and computers, notably the HP-41 and HP-71 series)
 * HPLC – (i) High Performance Liquid Chromatography
 * HPMOR – (i) Harry Potter and the Methods of Rationality (work of Harry Potter fan fiction)
 * HPT – (i) High[er] Payoff Target
 * HPV – (i) Human Papilloma Virus

HQ

 * HQ –
 * (i) Headquarters
 * (s) Howland Island (FIPS 10-4 territory code)
 * HQ – (i) High Quality
 * HQDA – (i) Headquarters, Department of the Army

HR

 * hr – (s) Croatian language (ISO 639-1 code)
 * HR
 * (s) Croatia (FIPS 10-4 country code; ISO 3166 digram – from the country's native name of Hrvatska)
 * (s) Haryana (Indian state code)
 * (i) Harvard Revised star catalogue
 * Human Resources
 * HRBL – (i) High-level Representation of Behavior Language (original name of the Herbal language)
 * HRD – (i) Human Resource Development
 * HRED – (i) (U.S. Army Research Laboratory's) Human Research and Engineering Directorate (Aberdeen Proving Ground, Maryland)
 * HRF – (i) High Readiness Forces
 * HRH – (i) His (or Her) Royal Highness
 * HRK – (s) Croatian kuna (ISO 4217 currency code)
 * HRM – (i) His (or Her) Royal Majesty
 * HRM – (i) Human Resource Management
 * HRT – (i) Hormone Replacement Therapy
 * hrv – (s) Croatian language (ISO 639-2 code)
 * HRV
 * (s) Croatia (ISO 3166 trigram)
 * (i) High Resolution Visible

HS

 * Hs – (s) Hassium
 * HSA – A health savings account available to taxpayers in the United States.
 * HSBC – (i) The Hong Kong and Shanghai Banking Corporation
 * HSC
 * (i) Higher School Certificate
 * (i) Helicopter Sea Combat, a type of U.S Navy aviation squadron
 * HSM – (i) High School Musical
 * HSMAD – (i) Human Science/Modeling and Analysis Data
 * HSN – (i) Home Shopping Network
 * HSPH – (i) Harvard School of Public Health
 * HSS
 * (i) Health Service Support
 * (i) High-Speed Steel
 * HSSI – (i) High-Speed Serial Interface
 * HST – see entry
 * HSV
 * (i) Herpes Simplex Virus
 * Hue Saturation Value (colour model)

HT

 * ht – (s) Haitian Creole language (ISO 639-1 code)
 * HT
 * (s) Haiti (ISO 3166 digram)
 * (i) High Temperature
 * hoc tempore (Latin, "at this time")
 * hoc titulo (Latin, "under this title")
 * HTA – (i) HyperText Application
 * HTC
 * High Tech Computer Corporation, original name of the company now known simply as HTC
 * HTFU – (a) Harden The F**k Up
 * HTG – (s) Haitian gourde (ISO 4217 currency code)
 * HTH – (a) Hope That Helps
 * HTI – (s) Haiti (ISO 3166 trigram)
 * HTML – (i) HyperText Markup Language
 * HTS – (i) High-Temperature Superconducting wire
 * HTTP – (i) HyperText Transfer Protocol

HU

 * hu- (s) Hungarian language (ISO 639-1 code)
 * HU – (s) Hungary (ISO 3166 digram; FIPS 10-4 country code)
 * HUD – (i/a) Head-Up Display – Housing and Urban Development
 * HUF – (s) Hungarian forint (ISO 4217 currency code)
 * HUHA – (a) Head up his/her ass (Marine salute; probably a backcronym)
 * HUI - (s) IATA code for Hue's Phu Bai International Airport
 * HUMINT – (p) Human Intelligence (military parlance)
 * Hum-Vee – See HMMWV
 * hun – (s) Hungarian language (ISO 639-2 code)
 * HUN – (s) Hungary (ISO 3166 trigram)
 * HURD – (a) Hird of Unix-Replacing Daemons (cf. Hird)
 * HVU – (i) High Value Unit (military)

HV

 * HV – (s) Upper Volta (ISO 3166 digram; obsolete 1984)
 * HVAC – (s) Heating, ventilation and air conditioning Used in architecture, business and marketing; refers to a building's entire system of heating, moving, or cooling air.
 * HVAP – (i) High Velocity Armour Piercing (ammunition)
 * HVHF – (i)High velocity human factors
 * HVI - (i) High Value Individual
 * HVM – (i) High Velocity Missile
 * HVO – (s) Upper Volta (ISO 3166 trigram; obsolete 1984)
 * HVP –
 * (i) HarborView Properties
 * High vacuum process
 * Hydrolyzed vegetable protein
 * High Velocity Protection
 * H.V.P. (rapper)
 * High Voltage Protection
 * High Vapor Pressure
 * High-Velocity Projectile
 * High-Video Pass
 * High-Velocity Particle
 * Hub Voice Processor
 * Human Variome Project
 * HVT - (i) High-Value Target (US military terminology)

HW

 * HW – (p) Hardware – (i) High Water (nautical charts)
 * HWM – (i) Hardware morphing (computer graphics rendering)

HX

 * HX –
 * (s) IATA code of Hong Kong Airlines
 * (s) Medical history
 * (s) Hydrogen halide
 * (s) Concept automobile by HUMMER
 * HXB – (s) The glycoprotein Tenascian C

HY

 * hy – (s) Armenian language (ISO 639-1 code)
 * hye – (s) Armenian language (ISO 639-2 code)
 * HYP
 * (i) Halkın Yükselişi Partisi (Turkish: "People's Ascent Party"), a political party in Turkey
 * Harvard, Yale, Princeton (perennially at or near the top of American university rankings)
 * HYS – (i) Harvard, Yale, Stanford (perennially named as the top three law schools in the U.S.)

HZ

 * hz – (s) Herero language (ISO 639-1 code)
 * Hz – (s) Hertz
 * HZ – (s) Haze (METAR Code)