| Abbreviation | Definition |
|---|---|
| PIN | Postal Index Number |
| PIN | Personal Identification Number |
| PIN | Posterior Interosseous Nerve |
| PIND | Particle Impact Noise Detection |
| PIO | Programmed Input/Output |
| PIO | Public Information Office |
| PIO | Pilot-Induced Oscillation |
| PIO | Payload Integration Plan |
| PIOS | Point In Oncogene Synthesis |
| PIP | Personal Information Processing |
| PIP | Performance Incentive Points |
| PIP | Performance Improvement Potential |
| PIP | Performance Improvement Plan |
| PIP | Project Implementation Plan |
| PIP | Production Instrumentation Package |
| PIP | Plant Instrumentation Program |
| PIP | Payload Interface Plan |
| PIP | Payload Integration Plan |
| PIP | Pesticide Initiative Programme |
| PIPA | Pulse Integrating Pendulum Assembly |
| PIPA | Pulse Integrating Pendulum Accelerometers |
| PIPE | Practice In Programming Environment |
| PIQ | Position Information Questionnaire |
| PIQ | Pre- Inspection Questionnaire |
| PIR | Pensioner initiated review |
| PIREP | Pilot Weather Report |
| PIRN | Preliminary Interface Revision Notice |
| PIT | Pilot In Training |
| PIT | Prophet In Training |
| PIT | Preinstallation Test |
| PITG | Payload Integration Task Group |
| PITS | Payload Integration Test Set |
| PIU | Pyrotechnic Initiator Unit |
| PIU | Power Interface Unit |
| PIV | Peak Inverse Voltage |
| PJ | Pointer Justification |
| PJ | Pararescue Jumper |
| PJD | Precision Jet Drive |
| PJTC | Permanent Joint Technical Commission for Nile Waters |
| PK | Professional Knowledge |
| PL | Program Line |
| PL | Project Leader |
| PLA | Parachute Location Aid |
| PLACE | Position Location Aircraft Communications Equipment |
| PLAK | PLM Late Access Kit |
| PLAN | Position Level Actions Network |
| PLB | Primary Lymphoma of Bone |
| plc | public limited company |
| PLC | Power Line Communication |
| PLC | Primary Liver Cancer |