| Acronym | Meaning |
 | PIG | Pipeline Inspection Gauge |
| PIM | 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 | Personal Identification Number |
| PINF | People In Need Foundation (Czech Charitable Organisation) |
| PIPA | Program On International Policy Attitudes |
| PIR | Priority Intelligence Requirement |
| PIRA | Provisional Irish Republican Army |
| PIREPS | Pilot Reports |
| PITA | Pain In The Ass |
| PJ | Petajoule |
| PJ | Picojoule |
| PJHQ | Permanent Joint Headquarters |
| PJS | Pajamas (pee-jayz) |
| PK | Pakistan (ISO 3166 And FIPS 10-4 Country Code Digram) - Petakelvin -Player Kill[er] - Probability Of Kill -PolyKetone -Pulemet Kalashnikova (Russian ?? ??????? ??????????? |
| PK | Picokelvin |
| PKA | Previously Known As - Professionally Known As |
| PKI | Public Key Infrastructure (cryptography) |
| PKM | Pulemet Kalashnikova Modernizirovanniy (Russian ??? ??????? ??????????? ????????????????? |
| PKMS | Pulemet Kalashnikova Modernizirovanniy Stepanova (Russian ???? ??????? ??????????? ????????????????? ????????? |
| PKR | Pakistani Rupee (ISO 4217 Currency Code) |
| PKT | Pulemet Kalashnikova Tankoviy (Russian ??? ??????? ??????????? ???????? |
| PL | Ice Pellets (new Style METAR Code) -petalitre -Phase Line (Co-ordination Line) -Poland (ISO 3166 And FIPS 10-4 Country Code Digram) |
| PL | Picolitre |
| PL | Polish Language (ISO 639-1 Code) |
| PLAF | Product Line Architecture Framework |
| PLAID | Precision Location And Identification |
| PLB | Personal Locator Beacon |
| PLC | Public Limited Company (British) |
| PLCC | Plastic Leaded Chip Carrier (electronics) |
| PLD | Probable Line Of Deployment |
| PLF | Parachute Landing Fall |
| PLGR | Precision Lightweight GPS Receiver (plugger) |
| PLI | Position Location Information - Private Lands Initiative - Professional Liability Insurance |
| PLI | P?li Language (ISO 639-2 Code) |
| PLIF | Planar Laser-Induced Fluorescence |
| PLL | Phase-Locked Loop (electronics) |
| PLM | Polarized Light Microscope/Microscopy |
| PLN | Platoon |
| PLN | Polish Zloty (ISO 4217 Currency Code) |
| PLO | Palestine Liberation Organization |
| PLOKTA | Press Lots Of Keys To Abort |
| PLP | Platonic Life Partner |
| PLS | Palletized Loading System - Personal Locator System |
| PLUTO | Pipe Line Under The Ocean |
| PLW | Palau (ISO 3166 Trigram) |
| PM | Panama (FIPS 10-4 Country Code) -Perry Mason - Phase Modulation - Post Meridiem (Latin After Noon) - Prime Minister - Project Manager -Saint Pierre And Miquelon (ISO 3166 Digram) |
| PM | Petametre - Promethium |
| PM | Picometre |
| PMC | Primary Motor Cortex |
| PMCS | Partial Mission Capable Supply (SM&R Code) - Power Management Control System - Professional Military Comptroller School |
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