List of acronyms: P

(Main list of acronyms)


 * p – (s) pico
 * P – (s) Peta – Phosphorus

P0–9

 * P2P – (i) Peer-to-peer (networking)
 * P3I or P3I – (i) PrePlanned Product Improvement

PA

 * pa – (s) Punjabi language (ISO 639-1 code)
 * pA – (s) picoampere
 * Pa
 * (s) pascal
 * Protactinium
 * PA
 * (a/i) Pamela Anderson
 * (s) Panama (ISO 3166 digram)
 * Paraguay (FIPS 10-4 country code)
 * (i) Partial Agonist
 * (s) Pennsylvania (postal symbol)
 * petampere
 * (i) PolyAmide (Nylon)
 * Prince Albert piercing
 * Public Address (vocal amplification system)
 * Public Affairs
 * PA 6 – (s) Nylon 6 (PolyAmide) (similarly for PA 11, 12, 46, 66, 610)
 * PAA – (i) Position Area for Artillery
 * PAB – (s) Panamanian balboa (ISO 4217 currency code)
 * PABX – (p) Private Automated Branch eXchange (company phone system)
 * PAC
 * (i) Pan Africanist Congress
 * (a) Partial Solar Calibrator
 * Patriot Advanced Capabilities
 * Political action committee
 * (a/i) Primary Auditory Cortex
 * PACER – (a) Public Access to Court Electronic Records (U.S. federal courts)
 * PACOM – (p) (U.S.) Pacific Command
 * PADD
 * (a) Personal Access Display Device (as seen in the Star Trek franchise)
 * Petroleum Administration for Defense Districts, used for data collection in the U.S. petroleum industry
 * PADI – (a) Professional Association of Diving Instructors
 * PAEK – (i) PolyArylEtherKetone
 * PAFC – (i) Plymouth Argyle Football Club
 * PAH – (i) Polycyclic aromatic hydrocarbon
 * PAHO – (i) Pan American Health Organization
 * PAI
 * (i) PolyAmide Imide
 * Pre-Approval Inspection (pharma)
 * PAK – (s) Pakistan (ISO 3166 trigram)
 * Pakistan – (p) Punjab, Afghan states, Kashmir, sIndh, baluchiSTAN
 * PAL
 * (a) Phase Alternating Line (TV standard)
 * (p) Philippine Airlines
 * PAM – (a/i) Precision Attack Missile
 * Pamida – (p) Patrick, Michael, and David, sons of the department store chain's co-founder Jim Witherspoon
 * PAMELA
 * (a) Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics
 * (a) Pedestrian Accessibility and Movement Environment Laboratory
 * pan – (s) Punjabi language (ISO 639-2 code)
 * PAN
 * (s) Panama (ISO 3166 trigram)
 * (a) Partai Amanat Nasional (Indonesian, "National Mandate Party") – Indonesian political party
 * Partido Acción Nacional (Spanish, "National Action Party") – political parties in El Salvador, Mexico, and Nicaragua
 * Partido de Avanzada Nacional (Spanish, "National Advancement Party") – Guatemalan political party
 * Personal area network
 * (i) PolyAcryloNitrile
 * (a) Programa de Asistencia Nutricional (Spanish, "Nutritional Assistance Program") – U.S. federal program for nutritional needs of poor families in Puerto Rico
 * PANS – (a) Pretty Advanced/Awesome Network Services (cf. POTS)
 * Pan-STARRS – (p) Panoramic Survey Telescope And Rapid Response System
 * PAO
 * (i) Panathinaikos Athlitikos Omilos (Greek: Παναθηναϊκός Αθλητικός Όμιλος, "Pan-Athenian Athletic Club")
 * (a/i) Poly Alpha Olefin
 * Public Affairs Officer
 * PAOK – (i) Panthessalonikeios Athlitikós Ómilos Konstantinoupoliton (Greek Πανθεσσαλονίκειος Αθλητικός Όμιλος Κωνσταντινοπολιτών, "Pan-Thessalonian Athletic Club of Constantinopolites")
 * PAP
 * (i) People's Action Party (Singapore)
 * (a) Internet slang for Post a Picture
 * PAPI – (a) Precision Approach Path Indicator (aviation)
 * PAR – (s) Paraguay (IOC and FIFA trigram, but not ISO 3166)
 * PARC – (a) Palo Alto Research Center
 * PAROS – (a) Prevention of an Arms Race in Outer Space (treaty)
 * PARP – (i) (NATO Partnership for Peace) Planning And Review Process
 * PARWIG – (a) Power Augmented Ram Wing In Ground (aeroplane wing shape)
 * PAS – See entry
 * PASA – (i) PolyAmide, Semi-Aromatic (Nylon)
 * PASGT – (i) Personnel Armor System, Ground Troops
 * PASR – (i) Personnel Accounting and Strength Reporting
 * PatD - (s) Panic! at the Disco
 * PATH – (a) Port Authority Trans-Hudson
 * PAWS
 * (a) Phased Array Warning System
 * Progressive Animal Welfare Society
 * PAYD – (a) Pay As You Drive
 * PAYE – (a) Pay As You Earn

PB

 * Pb – (s) Lead (Latin Plumbum)
 * PB – (p) PolyButylene
 * PBA
 * (i) Philippine Basketball Association
 * Professional Bowlers Association
 * PBB – (p) PolyBrominated Biphenyl
 * PBC
 * (i) Push Button Connect, a WPS method
 * (i) Playback Control, a feature on Video CD and Super Video CD
 * PBCK – (i) Problem Between Chair and Keyboard (computer help desk in-joke)
 * PBD – (p) PolyButaDiene
 * PBDE – (i) PolyBrominated Diphenyl Ether
 * PBI – (p) PolyBenzImidazole
 * PBIS - Positive Behavior Interventions and Supports
 * PBN – (p) PolyButylene Naphthalate
 * PBOH – (i) Please Become Old History
 * PBR
 * (i) Pabst Blue Ribbon (beer brand)
 * Professional Bull Riders
 * PBS
 * (i) Pharmaceutical Benefits Scheme (Australia)
 * Public Broadcasting Service (U.S.)
 * Public Broadcasting Services (Malta)
 * PBRT - may stand for: Physically Based Raytracing, an open source software rendering system for physically correct image synthesis.
 * PBT – (p) PolyButylene Terephthalate
 * PBX – (p) Private Branch eXchange (company phone system)

PC

 * pC – (s) picocoulomb
 * PC
 * (s) petacoulomb
 * U.S. Pacific Islands Trust Territory (ISO 3166 digram; obsolete 1986)
 * (i) Personal computer
 * Player Character (roleplaying)
 * Politically Correct / Political Correctness
 * post cibum (Latin, "after meals")
 * PCAS – (i) Planet-Crossing Asteroid Survey
 * PCB – see entry
 * PCC
 * (i) NATO Partnership Coordination Cell
 * Posterior Cingulate Cortex
 * Pre-Command Course
 * Presidents Conference Committee
 * PCCB – (i) Porsche Ceramic Composite Brake
 * PCCIP – (i) President's Commission on Critical Infrastructure Protection
 * PCE – (p) PerChlorEthylene
 * PCI
 * (s) U.S. Pacific Islands Trust Territory (ISO 3166 trigram; obsolete 1986)
 * (i) Peripheral Component Interconnect (computer bus)
 * PCIe – (i) Peripheral Component Interconnect Express (computer bus)
 * PCL – (i) Passive Coherent Location
 * PCMCIA – (i) Personal Computer Memory Card International Association (People Can't Memorise Computer-Industry Acronyms)
 * PCN – (s) Pitcairn Islands (ISO 3166 trigram)
 * PCP
 * (p) phencyclidine
 * Pneumocystis jiroveci pneumonia (formerly Pneumocystis carinii)
 * (i) Probabilistically Checkable Proof
 * PCPI – Physician Consortium for Performance Improvement (AMA)
 * PCR – (i) Polymerase chain reaction
 * PCSSD - (p) Pulaski County Special School District
 * PCT
 * (i) Pacific Crest Trail
 * Patent Cooperation Treaty
 * PCTE
 * (i) Portable Common Tool Environment
 * (i) Punjab College of Technical Education
 * PCZ – (s) Panama Canal Zone (ISO 3166 trigram; obsolete 1980)

PD

 * Pd – (s) Palladium
 * PD
 * (i) per diem (Latin: (calculated) by the day)
 * Point of Departure
 * Police Department
 * Postal District
 * Potential Difference
 * Principal Deputy
 * Privatdozent
 * Public domain
 * PD – (i) Product Director—Example: CERDEC Product Director C4ISR and Network Modernization
 * PDA
 * (i) Personal Digital Assistant
 * Predicted Drift Angle
 * Public Display of Affection
 * Push-Down Automaton
 * PDD
 * (i) Past Due Date
 * Presidential Decision Directive
 * PDF
 * (i) Panama[nian] Defense Forces (abolished 1990)
 * Portable Document Format
 * Principal Direction of Fire
 * PDG
 * (i) President Director General
 * Product Development Group
 * PDL
 * (i) Premier Development League, a former name of the U.S. minor soccer league now known as USL League Two
 * Pure Dumb Luck (Texan punk band)
 * PDN – (i) Pull-Down Network
 * PDP
 * (i) Programmable Data Processor
 * Performance Development Plan
 * PDQ
 * (i) Pre-Defined Queries (Siebel packages)
 * Pretty Damn Quick
 * PDRY – (i) People's Democratic Republic of Yemen (obsolete since 1990)
 * PDT – (i) Pacific Daylight [Saving] Time (UTC-7 hours)
 * PDU
 * (i) Police Dog Unit
 * Power Distribution Unit
 * Protocol Data Unit
 * PDVSA – (a/i) Petróleos de Venezuela, S.A. (Spanish, "Venezuelan Petroleum Company")

PE

 * PE – Professional Engineer
 * PE – (s) Ice Pellets (old style METAR Code) – Peru (ISO 3166 and FIPS 10-4 country code digram) – (i) Physical Education – Premature Ejaculation – (s) Prince Edward Island (postal code) – Price to Earning ratio (used for equity shares) – Plant Extract
 * PEBCAC – (a) Problem Exists Between Chair and Computer (IT help desk in-joke)
 * PEBKAC – (a) Problem Exists Between Keyboard and Chair (ditto)
 * PEEK – (i) PolyEtherEtherKetone
 * PEET – (a) Partnerships for Enhancing Expertise in Taxonomy
 * PEGIDA – (a) Patriotische Europäer gegen die Islamisierung des Abendlandes (German, "Patriotic Europeans Against the Islamization of the West")
 * PEI – (i) Prince Edward Island – PolyEtherImide
 * PEK – (i) PolyEtherKetone
 * PEMDAS - The order of operations in math (Parentheses, Exponents, Division, Multiplication, Addition, Subtraction)
 * PEN
 * (s) Peruvian sol (ISO 4217 currency code)
 * (i) Poets, Essayists and Novelists, the original meaning of the initialism of the organization now known as PEN International
 * PolyEthylene Naphthalate
 * PEO – (i) Παγκύπρια Εργατική Ομοσπονδία (Greek for "Pancyprian Federation of Labour") – Philanthropic Educational Organization – PolyEthylene Oxide – Professional Employer Organization – Professional Engineers Ontario
 * PEPFAR – (a) President's Emergency Plan For AIDS Relief
 * PER – (s) Peru (ISO 3166 trigram)
 * perl – (a) usually lower case Practical Extraction and Report Language
 * PERM - Program Electronic Review Management
 * PES – (i) PolyEtherSulfone
 * PEST – (a) UK Public Engagement with Science and Technology
 * PET – (a/i) Personal Electronic Transactor – Pierre Elliott Trudeau – Positron Emission Tomography (as in PET scan) – PolyEthylene Terephthalate (plastic) – (a) Preliminary English Test
 * PETA – (a/i) pentaerythritol triacrylate – People Eating Tasty Animals – People for the Ethical Treatment of Animals
 * PETE – (i) PolyEthyleneTErephthalate
 * PETP – (i) PolyEthyleneTerePhthalate

PF

 * pF – (s) picofarad
 * PF
 * (s) French Polynesia (ISO 3166 digram)
 * petafarad
 * (i) Phenol Formaldehyde (resin)
 * Power forward, a player position in Australian rules football, basketball, and ice hockey
 * PFD – (i) Permanent Fund Dividend = personal flotation device
 * PFE – (i) Permanent Forest Estate
 * PFLAG – (p) Parents, Families and Friends of Lesbians and Gays ("pee-flag")
 * PFIY – (a) Please Fix it Yourself ("pee-fiy")
 * PFO – (i) Pissed, Fell Over (medical diagnosis in-joke)
 * PfP – (i) Partnership for Peace
 * PFW
 * (i) Pro Football Weekly (magazine and website covering the National Football League)
 * Purdue University Fort Wayne

PG

 * pg – (s) picogram
 * Pg – (s) petagram
 * PG –
 * (i) propylene glycol
 * (s) Papua New Guinea (ISO 3166 digram)
 * (i) Parental Guidance (movie rating)
 * Point guard (basketball position)
 * PG-13 (disambiguation) – (p) (movie rating)
 * PGCE – (p) Postgraduate Certificate in Education
 * PGD – (i) Pre-implantation Genetic Diagnosis
 * PG&E – (i) Pacific Gas & Electric
 * PGENI – (i) Pharmaco-Genetics for Every Nation Initiative
 * PGH – (i) Pre-implantation Genetic Haplotyping
 * PGK – (s) Papua New Guinea kina (ISO 4217 currency code)
 * PGM – (i) Precision-Guided Munition
 * PGP – (i) Pretty Good Privacy

PH

 * pH
 * (s) parts of hydrogen (acidity/alkalinity index)
 * picohenry
 * PH
 * (i) Passive Homing (missile guidance system)
 * (s) petahenry
 * Philippines (ISO 3166 digram)
 * (i) Probability of Hit
 * Professional hunter (abbreviation used mostly in East and Southern Africa)
 * Public Health
 * Purple Heart
 * (i) Pakatan Harapan (Malaysia)
 * PHA
 * (p) PolyHydroxyAlkanoate
 * (i) Potentially hazardous asteroid
 * Ph.D. – (p) Philosophiæ Doctor (Latin, "Doctor of Philosophy")
 * PHEV – (i) Plug-in hybrid electric vehicle
 * PHF
 * (i) Paired helical filaments (aggregations of tau proteins in the human brain associated with tauopathy)
 * Potentially Hazardous Food
 * Premier Hockey Federation (defunct North American women's ice hockey league)
 * PHL – (s) Philippines (ISO 3166 trigram)
 * PHQ - Patient Health Questionnaire
 * PHP
 * (s) Philippine peso (ISO 4217 currency code)
 * (i) PHP: Hypertext Preprocessor (originally Personal Home Page (Tools))

PI

 * pi – (s) Pāli language (ISO 639-1 code)
 * Pi – (s) Pebi
 * PI – (i) PolyImide – PolyIsoprene – Private Investigator
 * PIB – (i) PolyIsoButylene
 * PIC – (i) Person In Charge
 * PICNIC – (a) Problem In Chair Not In Computer
 * PICS – (i) Private Investment Capital Subscription
 * PID – (i) Pelvic Inflammatory Disease – (p) Plan Identification Number – Positive Identification – Procedural Identification – (i) Procurement Identification Description
 * PIDOOMA – (a/i) Pulled It Directly Out Of My Ass
 * PIF – (a/i) Partners in Flight
 * PIG – (a) Pipeline Inspection Gauge
 * PIGS (also PIIGS or PIIGGS) – (a) Portugal, Italy, Greece, Spain; PIIGS if including Ireland; PIIGGS if including the United Kingdom (Great Britain)
 * PIGS – Passenger Inert Guidance Systems – Movable tape barrier, typically used on airport aprons to guide passengers to/from their aircraft avoiding danger areas.
 * PIM – (a/i) Parameterized Ionospheric Model – Path of Intended Motion – Pediatric Index of Mortality – Personal Information Manager/Management – Presence and Interworking Mobility – Processor-In-Memory – Program Integration Manager – Protocol Independent Multicast
 * PIN – (a) Personal Identification Number
 * PINF – (i) People In Need Foundation (Czech charitable organisation)
 * PIPA – (a/i) Program on International Policy Attitudes
 * PIR – (i) Priority Intelligence Requirement
 * PIRA – (a) Provisional Irish Republican Army
 * PIREPS – (p) Pilot Reports
 * PITA – (a) Pain In The Ass
 * P.I. - Philippines Islands
 * PITS - Person In The Seat. A common problem as to why a computer is not working properly. It is a PITS issue.

PJ

 * pJ – (s) picojoule
 * PJ – (s) petajoule
 * PJHQ – (p) Permanent Joint Headquarters
 * PJs – (p) Pajamas ("pee-jayz")

PK

 * K – (s) picokelvin
 * PK – (s) Pakistan (ISO 3166 and FIPS 10-4 country code digram) – petakelvin – (i) Player Kill[er] – Probability of Kill – (p) PolyKetone – (i) Pulemet Kalashnikova (Russian ПК пулемет Калашникова, "Machinegun Kalashnikov")
 * PKA – (i) previously known as – professionally known as
 * PKE – (i) Partnership of Kindermusik Educators
 * PKI – (i) public key infrastructure (cryptography)
 * PKM – (i) Pulemet Kalashnikova Modernizirovanniy (Russian ПКМ пулемет Калашникова модернизированный, "Machinegun Kalashnikov Modernised")
 * PKMS – (i) Pulemet Kalashnikova Modernizirovanniy Stepanova (Russian ПКМС пулемет Калашникова модернизированный Степанова, "Machinegun Kalashnikov Modernised Stepanova")
 * PKMT – (i) Pulemet Kalashnikova Modernizirovanniy Tankoviy (Russian ПКМТ пулемет Калашникова модернизированный танковый, "Machinegun Kalashnikov Modernised Tank") (a.k.a. PKTM)
 * PKR
 * (s) Pakistani rupee (ISO 4217 currency code)
 * (i) People's Justice Party (Malaysia)
 * PKT – (i) Pulemet Kalashnikova Tankoviy (Russian ПКТ пулемет Калашникова танковый, "Machinegun Kalashnikov Tank")
 * PKTM – (i) Pulemet Kalashnikova Tankoviy Modernizirovanniy (Russian ПКТМ пулемет Калашникова танковый модернизированный, "Machinegun Kalashnikov Tank Modernised") (a.k.a. PKMT)
 * PKU – (p) Phenylketonuria

PL

 * pl – (s) Polish language (ISO 639-1 code)
 * pL – (s) picolitre
 * PL
 * (s) Ice Pellets (new style METAR Code)
 * (s) petalitre
 * (i) Phase Line (Co-ordination Line)
 * (s) Poland (ISO 3166 and FIPS 10-4 country code digram)
 * PLA
 * (i) People's Liberation Army (Chinese military forces)
 * Programmable logic array
 * PLAF
 * (a/i) People's Liberation Armed Forces
 * Pluggable look and feel
 * Product Line Architecture Framework
 * PLAID – (p) Precision Location and Identification
 * PLB – (i) Personal Locator Beacon
 * PLC – (i) Public Limited Company (British)
 * PLCC – (i) Plastic Leaded Chip Carrier (electronics)
 * PLD – (i) Probable Line of Deployment
 * PLEBS – (i) People Lacking Everyday Basic Skills
 * PLF – (i) Parachute Landing Fall
 * PLGR – (a) Precision Lightweight GPS Receiver ("plugger")
 * pli – (s) Pāli language (ISO 639-2 code)
 * PLI
 * (i) Position Location Information
 * Practising Law Institute
 * Private Lands Initiative
 * Professional Liability Insurance
 * PLIF – (a) Planar Laser-Induced Fluorescence
 * PLK – (i) Polska Liga Koszykówki (Polish, "Polish Basketball League")
 * PLKK – (i) Polska Liga Koszykówki Kobiet (Polish, "Polish Women's Basketball League"), former name of the league now known as Basket Liga Kobiet
 * PLL
 * (i) Phase-Locked Loop (electronics)
 * Premier Lacrosse League
 * PLM – (i) Polarized Light Microscope/Microscopy
 * PLMBA - (i)  Phospholipid Bilayer Microarray
 * Pln – (p) Platoon
 * PLN – (s) Polish zloty (ISO 4217 currency code)
 * PLO – (i) Palestine Liberation Organization
 * PLOKTA – (a) Press Lots Of Keys To Abort
 * PLP – (i) Platonic Life Partner
 * PLS
 * (i) Palletized Loading System
 * Personal Locator System
 * PLUTO – (a) Pipe Line Under The Ocean
 * PLW – (s) Palau (ISO 3166 trigram)

PM

 * pm – (s) picometre
 * Pm – (s) petametre – Promethium
 * PM – (s) Panama (FIPS 10-4 country code) – (i) Perry Mason – Phase Modulation – Post Meridiem (Latin "after noon") – Prime Minister – Project Manager – (s) Saint Pierre and Miquelon (ISO 3166 digram)
 * PMC – (i) Primary Motor Cortex
 * PMCS – (i) Partial Mission Capable Supply (SM&R code) – Power Management Control System – Professional Military Comptroller School
 * PME – (i) Professional Military Education
 * PMHT – (i) Pardon My Hashtag (Also #PMHT)
 * PMI – (i) Positive Material Identification
 * PMID – (p) PubMed Identifier
 * PMMA – (i) PolyMethylMethAcrylate
 * PMO — Principal Medical Officer (UK, Canada, India, and Ireland)
 * PMOS – (i/a) P-type/Positive Metal-Oxide-Semiconductor transistor ("pee-moss")
 * PMS – (i) Premenstrual Syndrome
 * PMSC – (i) NATO Political-Military Steering Committee on Partnership for Peace
 * PMSL – (i) Piss Myself Laughing (Internet shorthand)
 * PMT - Premenstrual Tension (UK) (see Premenstrual Syndrome)

PN

 * pN – (s) piconewton
 * PN
 * (s) petanewton
 * Pitcairn Islands (ISO 3166 diagram)
 * (i) Perikatan Nasional (Malaysia)
 * PNAC – (i) Project for the New American Century
 * PNC
 * (i) Palestinian National Council
 * Palmerston North City (cf. PNC, a New Zealand rapper from this city)
 * Parti nationaliste chrétien, defunct Quebec political party
 * Pittsburgh National Corporation, one of the two companies that merged into today's PNC Financial Services
 * Provident National Corporation, the other company that merged into PNC Financial Services
 * PNF – (i) Pilot Not Flying (aviation)
 * PNG
 * (s) Papua New Guinea (ISO 3166 trigram)
 * (i) Portable Network Graphics
 * PNP
 * Parti national populaire, defunct Quebec political party
 * (i) Partido Nuevo Progresista
 * Plug 'N' Play/Pray
 * Positive Negative Positive
 * PNS – (s) Pensacola, Florida (IATA airport code)
 * PNVS – (i) Pilot Night Vision Sensor
 * PNH
 * (i) Paroxysmal nocturnal hemoglobinuria
 * Police Nationale d'Haïti (French, "National Police of Haiti")

PO

 * Po – (s) Polonium
 * PO
 * (s) Dust Devil (METAR Code)
 * (i) per os (Latin, "by mouth")
 * (s) Portugal (FIPS 10-4 country code)
 * PO – (i) Post Office
 * PO – (i) Purchase Order
 * POCD – (i) Post-Operative Cognitive Dysfunction
 * pod – (a) Plain Old Documentation
 * POD
 * (i) Payable on Death (banking term, and the full name of American metal band P.O.D.)
 * Point of divergence (alternate or counterfactual history)
 * Port of Debarkation
 * POE – (a) Perl Object Environment – (b) Port Of Embarkation (c) Polyol Este r (d) Power Over Ethernet
 * POETS – (a) Portable Occultation, Eclipse, and Transit electronic-camera System
 * POFF – (a) Plain Old Flat File
 * POG – (a) Passionfruit, Orange and Guava
 * POGO – (a) Project On Government Oversight
 * POI
 * (i) Program Of Instruction
 * (i) Place of Interest
 * (i) Point of Interest
 * (i) Person of Interest
 * POK – (a/i) Plane Of Knowledge
 * pol – (s) Polish language (ISO 639-2 code)
 * POL
 * (i) Petroleum, Oils and Lubricants
 * (s) Poland (ISO 3166 trigram)
 * POLAD – (p) Political Advice
 * POM
 * (i) Program Objective Memorandum
 * PolyOxyMethylene
 * POMDP – (i) Partially observable Markov decision process
 * POP
 * (a/i) Point of Presence
 * Post Office Protocol
 * Progesterone Only Pill
 * por – (s) Portuguese language (ISO 639-2 code)
 * POR
 * (s) Portugal (FIFA and IOC trigram, but not ISO 3166)
 * (i) Proposed Operational Requirement
 * POS
 * (a/i) Point Of Sale terminal (retail industry transaction computers)
 * (i) Piece Of Shit
 * Position
 * POSH – (a) Port Outbound Starboard Home (alleged)
 * POTC o PotC – (a) Pirates of the Caribbean
 * POSSLQ – Person of the Opposite Sex Sharing Living Quarters
 * POT – (a/i) Plane Of Tranquility
 * POTS
 * (a) Plain Old Telephone Service (cf. PANS)
 * Postural orthostatic tachycardia syndrome
 * POV – (i) Point of view / Point of vision
 * POW – (i) Prisoner of war

PP

 * pp
 * pages, especially in references, e.g. "A. U. Thor, Title, Journal X, Vol. 1, no. 2 (2010) pp. 13-42."
 * PP
 * (s) Papua New Guinea (FIPS 10-4 country code)
 * (i) Passage Point
 * per procurationem (Latin, "by proxy")
 * PPA
 * (i) Parahippocampal Place Area
 * PolyPhthalAmide
 * PPASC – (i) (U.S.) Plans and Program Analysis Support Center
 * PPASSCCATAG - (a) "Proud Parents Against Singles, Seniors, Childless Couples And Teens And Gays", a fictional group formed by Marge Simpson
 * PPCLI – (i) Princess Patricia's Canadian Light Infantry (regiment)
 * PPG
 * (i) Pittsburgh Plate Glass (the original name of the company now known as PPG Industries)
 * The Powerpuff Girls
 * PPL
 * (i) Pakistan Petroleum Limited
 * Pay per lead (marketing)
 * Pennsylvania Power & Light, former name of the U.S. utility company now known as PPL
 * Pfadfinder und Pfadfinderinnen Liechtensteins (German, "Scouts and Guides of Liechtenstein")
 * Phonographic Performance Limited (UK performing rights organisation)
 * PPLI – (i) Precise Participant Location & Identification
 * ppm – (i) Parts Per Million
 * PPM – (i) Parts Per Million
 * PPM – (i) Project Planning and Management
 * PPO – (i) PolyPhenylene Oxide
 * PPP
 * (i) Point-to-Point Protocol
 * Purchasing Power Parity
 * PPQ – (i) Pulses Per Quarter (used in music programming, sequencers)
 * PPQN – (i) Pulses Per Quarter Note (ditto)
 * PPQT – (i) Pre-Production Qualification Test
 * PPS
 * (i) post postscriptum
 * Precise/Precision Positioning Service (GPS)
 * PolyPhenylene Sulfide
 * PPV – (a) Pay-per-view

PQ

 * PQ
 * (s) Province of Québec (obsolete postal code, replaced by QC)
 * (i) Parti Québécois

PR

 * Pr – (i) Pastor or Priest
 * Pr – (s) Praseodymium
 * PR
 * (i) Public Relations
 * (s) Puerto Rico (postal symbol; ISO 3166 digram)
 * Prb – (i) Presbyter
 * PRBO – (i) Point Reyes Bird Observatory
 * PRC – (i) People's Republic of China
 * PRD – (i) CERDEC Product Realization Directorate
 * PRFG – (s) Partial Fog (METAR Code)
 * PRI – (s) Puerto Rico (ISO 3166 trigram)
 * Prinair - Puerto Rico International Airlines
 * PRK – (s) Democratic People's Republic of Korea (ISO 3166 trigram)
 * PRM – (i) Personnel Readiness Management
 * PRN – (i) pro re nata (Latin, "for the emergency", "as needed")
 * PRT
 * (s) Portugal (ISO 3166 trigram)
 * (i) Provincial Reconstruction Team
 * PRY – (s) Paraguay (ISO 3166 trigram)

PS

 * ps
 * (s) Pashto language (ISO 639-1 code)
 * picosecond
 * pS – (s) picosiemens
 * Ps – (s) petasecond
 * PS
 * (s) Palestinian Territory, Occupied (ISO 3166 digram)
 * (i) Personnel Services
 * (s) petasiemens
 * (i) post scriptum (Latin, "written after")
 * Power Steering
 * Power Supply
 * Public School
 * PooS – Poo Sniffer (Internet shorthand)
 * PSA
 * Pacific Southwest Airlines
 * (i) Paralysis Society of America
 * Pharmaceutical Society of Australia
 * Pressure-Sensitive Adhesive
 * Production Services Association
 * Prostate Specific Antigen
 * Public Service Announcement
 * Public Service Association
 * PSC
 * (i) Personal service corporation
 * Primary Somatosensory Cortex
 * PSE
 * (s) Palestinian Territory, Occupied (ISO 3166 trigram)
 * (i) Precision Shooting Equipment, the expanded name of PSE Archery
 * PSG
 * (i) Pacific Seabird Group
 * Paris Saint-Germain
 * PSI - (i) Pounds per square inch
 * PSI – (a/i) Portable Source Initiative
 * PSO
 * (i) Peace Support Operations
 * Primary Standardisation Office (ABCA)
 * Protocol Supporting Organization (of the ICANN)
 * PSS – (i) Personnel System Support
 * PST – (i) Pacific Standard Time (UTC−8 hours)
 * PSU – (i) Pennsylvania State University
 * PSV
 * (i) Philips Sport Vereniging (Dutch for "Philips Sports Union")
 * Public Service Vehicle
 * PsyOp – (p) Psychological Operations

PT

 * pt – (s) Portuguese language (ISO 639-1 code)
 * pT – (s) picotesla
 * Pt – (s) Platinum
 * PT – (s) petatesla – (i) Physical Training (in the Army) – (s) Portugal (ISO 3166 digram)
 * PTA – (i) Parent-Teacher Association
 * PTAL – (i) Public Transport Accessibility Level
 * PTAN –
 * (i) Precision Terrain Aided Navigation
 * (a) (pronounced P-tan) Provider Transaction Access Number
 * PTCAS - Physical Therapy Centralized Application System
 * PTES - (i) People's Trust for Endangered Species
 * PTFE – (i) PolyTetraFluoroEthylene
 * PTI – (i) Pardon the Interruption
 * PTL – (p) Patrol – (i) Primary Target Line
 * PTO – (i) Patent and Trademark Office – Please Turn Over
 * PTSD – (i) Posttraumatic stress disorder
 * PTUI – (a/i) Plain-Text User Interface ("pa-too-ey") (cf CLI)

PU

 * Pu – (s) Plutonium
 * PU
 * (s) Guinea-Bissau (FIPS 10-4 country code)
 * (i) Polyurethane
 * (s) United States Miscellaneous Pacific Islands (ISO 3166 digram; obsolete 1986)
 * Pub – (p) Publication
 * PUG – (a/i) PET Users Group
 * PUN – (a/i) Pull-Up Network
 * PUP – (a/i) Pull-Up Point
 * PUR – (s) Puerto Rico (IOC and FIFA trigram, but not ISO 3166)
 * pus – (s) Pashto language (ISO 639-2 code)
 * PUS – (s) United States Miscellaneous Pacific Islands (ISO 3166 trigram; obsolete 1986)

PV

 * pV – (s) picovolt
 * PV – (s) petavolt
 * PVC
 * (i) Permanent Virtual Circuit
 * PolyVinyl Chloride
 * Premature Ventricular Contraction
 * Primary Visual Cortex
 * PvE – (i) Player versus Environment
 * PvP – (i) Player versus Player
 * PVR – (i) Personal Video Recorder
 * PvZ – (i) Plants vs. Zombies

PW

 * pW – (s) picowatt
 * PW
 * (s) Palau (postal symbol; ISO 3166 digram)
 * petawatt
 * PWA – (i) Pirates With Attitude
 * PWBA – (p) Pension and Welfare Benefits Administration
 * PwC – (i) PricewaterhouseCoopers (international accounting firm)
 * PWC – (i) PieceWise Constant (describing a mathematical function)
 * PWHL
 * (i) Professional Women's Hockey League, a North American women's ice hockey league
 * Provincial Women's Hockey League, a junior ice hockey league operating in the Canadian province of Ontario
 * PWL – (i) PieceWise Linear (describing a mathematical function)
 * PWLC – (i) PieceWise Linear and Concave/Convex (describing a mathematical function)
 * PWM - (i) Pulse-width Modulation
 * PWP – (i) Plot, What Plot? / Porn Without Plot (denotes plotless, um, "feel-good" stories in online fiction, especially fanfic or erotic fiction)
 * PWR – (i) Pressurized Water Reactor
 * PWV – (i) Pretoria-Witwatersrand-Vereeniging, the original name for the South African province now known as Gauteng, and still used to refer to the metropolitan agglomeration at the core of the province

PX

 * PX – (p) Post eXchange

PY

 * PY – (s) Paraguay (ISO 3166 digram) – Person-Year – (i) Portsmouth yardstick
 * PYF – (s) French Polynesia (ISO 3166 trigram)
 * PYG – (s) Paraguayan guaraní (ISO 4217 currency code)
 * PYMWYMI – (a) Put Your Money Where Your Mouth Is

PZ

 * PZ – (s) Panama Canal Zone (ISO 3166 digram; obsolete 1980) – (i) Pickup Zone