| POC | Payload Operations Center | In English | |
| POCC | Payload Operations Control Center | In English | |
| POCC | Payload/Platform Operations Control Center | In English | |
| POCN | Purchase Order Change Notice | In English | → 34745 |
| PoCom | Polymer Composites | In English | → Serial publications, periodicals → Chemical technology → Plastic industry |
| POD | Production Operations Directive | In English | → Management |
| POD | Parameter Override Display | In English | → Human-computer interaction |
| POD | Precision Orbit Determination | In English | → Spaceflight engineering, astronautics |
| POD | Payload Operations Division | In English | |
| PODTG | Precision Orbit Determination Task Group | In English | → Spaceflight engineering, astronautics |
| POE | Port of Embarkation | In English | |
| POE | Pilot Operational Equipment | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| POEM | Polar Orbiting Earth Mission | In English | → Astronomy → Earth sciences → Spaceflight engineering, astronautics |
| POF | Pictures of the Future | In English | |
| POGO | Polar Orbiting Geophysical Observatory | In English | → Geophysics → Spaceflight engineering, astronautics |
| POGS | Polar-Orbiting Geomagnetic Survey | In English | → Geophysics → Spaceflight engineering, astronautics |
| POHel | Publications of the Astronomical Observatory Helsinki | In English | → Serial publications, periodicals → Astronomy |
| POI | Power-On/Off Interrupt | In English | → Electrical engineering |
| POIC | Payload Operations Integration Center | In English | |
| POID | Power-On/Off Interrupt Delay | In English | → Electrical engineering |
| POJO | Plain Old Java Object | In English | → Programming languages |
| POL | Petroleum, Oil, and Lubricants | In English | → 665 |
| POLAR | Production Order Location and Reporting | In English | → Maintenance and logistics |
| POLAR | Production Order Location and Record | In English | → Maintenance and logistics |
| PolPh | Polymer Physics | In English | → Serial publications, periodicals → Chemistry → Chemical technology → Plastic industry |
| PolRe | National Institute Polar Research Memoirs | In English | → Serial publications, periodicals → Earth sciences |
| POM | Printer Output Microfilm | In English | → Graphic industries, printing, publishing |
| POM | Pallet-Only Mode | In English | |
| POMic | Publications of Michigan Observatory | In English | → Serial publications, periodicals → Astronomy |
| POMin | Publications of the Astronomical Observatory University of Minnesota | In English | → Serial publications, periodicals → Astronomy |
| POMS | Probability of Mission Success | In English | |
| POMT | Planning Operations Management Team | In English | → Management |
| POP | Preflight Operations Procedure | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| POP | Prelaunch Operations Plan | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| POP | Preburner Oxidizer Pump | In English | → Mechanical engineering |
| POP | Polar-Orbiting Platform | In English | → Spaceflight engineering, astronautics |
| POP | Perpendicular to Orbit Plane | In English | → Spaceflight engineering, astronautics |
| POP | Program Operating Plan | In English | |
| POP | Post Office Protocol | In English | → Networks, communication |
| POP | Presentation Oriented Publishing | In English | → Document processing |
| POPU | Push-Over/Pull-Up | In English | |
| POR | Point of Resolution | In English | |
| POR | Purchase Order Request | In English | → 34745 |
| POR | Power-On Reset | In English | → Electrical engineering |
| PORB | Production Operations Review Board | In English | → Maintenance and logistics |
| PORCN | Production Order Records Change Notice | In English | → Maintenance and logistics |
| POrCo | Progress in Organic Coatings | In English | → Serial publications, periodicals → Materials science |
| PORD | Performance and Operations Requirements Document | In English | → Management |
| PORR | Preliminary Operations Requirements Review | In English | |
| POS | Portable Oxygen System | In English | |
| POS | Probability Of Sufficiency | In English | |
| POS | Project Organisation System | In English | → 0057 |
| POSITIF | Policy-based Security Tools and Framework | In English | |
| POSIX | Portable Operating System Interface | In English | → Software → Human-computer interaction |
| POST | Program to Ootimize Simulated Trajectories | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| POST | Payload Operations Support Team | In English | |
| POT | Proximity Operations Trainer | In English | → Education |
| POT | Proof of Technology | In English | → Engineering, technology |
| POTS | Plain Old Telephone Service | In English | → Telecommunications |
| POV | Peak Operating Voltage | In English | → Electrical engineering |
| POV | Pneumatically Operated Valve | In English | |
| POV | Proximity Operations Vehicle | In English | → Vehicle engineering |
| POVRO | Publications of the Owens Valley Observatory | In English | → Serial publications, periodicals → Astronomy |
| POWG | Payload Orbital Working Group | In English | → Spaceflight engineering, astronautics |
| POWG | Payload Operations Working Group | In English | |
| POWS | Project Operating Work Statement | In English | → Management |
| PP | Planning Package | In English | |
| PP | Peak to Peak | In English | |
| PP | Power Plant | In English | → Energy economics → Electrical engineering |
| PP | Partial Pressure | In English | |
| PP | Premodulation Processor | In English | → Electronics |
| PP | Push-Pull | In English | |
| PP | Polypropylene | In English | → Plastic industry → Chemicals → Chemistry |
| PP | Polypropylen | In English | → Plastic industry |
| PP&C | Project Planning and Control | In English | → Management |
| PP&C | Program Planning and Control | In English | → Management |
| PP&LS | Production Planning and Logistics Support | In English | → Maintenance and logistics |
| PP&WC | Process Planning and Work Control | In English | → Maintenance and logistics |
| PPA | Power Pitch-Around | In English | → Electrical engineering |
| PPAR | Peroxisome Proliferator Activated Receptor | In English | → Biochemistry, biophysics |
| PPARC | Particle Physics and Astronomy Research Councils | In English | → Astronomy → Physics |
| PPARC | Particle Physics and Astronomy Research Council | In English | → Organizations and associations → Astronomy |
| PPB | Program Performance Baseline | In English | → Management |
| PPB | Provisioning Parts Breakdown | In English | → Maintenance and logistics |
| PPC | Preprocessing Center | In English | → Computer science |
| PPC | Phased Provisioning Code | In English | |
| PPC | Payload Preparation Complex | In English | |
| PPC | Pay per click | In English | → 659 |
| PPCAS | Publication of the Pomona College Astronomical Society | In English | → Serial publications, periodicals → Astronomy |
| PPCF | Plasma Physics and Controlled Fusion (www.iop.org/EJ/journal/PPCF) | In English | → Serial publications, periodicals → Plasma physics → Nuclear technology |
| PPCP | Postprocessing Computer Program | In English | → Software |
| PPcPp | Progress in Photochemistry and Photophysics | In English | → Serial publications, periodicals → Electromagnetism |
| PPCRB | Post-Prison Community Based Release | In English | → Law, jurisprudence |
| PPCRV | Parish Pastoral Council for Responsible Voting (www.ppcrv.org) | In English | → Religion, theology |
| PPCU | Partial Payload Checkout Unit | In English | |
| PPD | Predefined Process Diagram | In English | |
| PPD | Power Pitch-Down | In English | → Electrical engineering |
| PPE | Phase Partitioning Experiment | In English | |
| PPE | Premodulation Processor Equipment | In English | → Electronics |
| PPEE | Periodica Polytechnica Electrical Engineering | In English | → Serial publications, periodicals → Electrical engineering |
| PPEP | Plasma Physics and Environmental Perturbation | In English | → Plasma physics |
| PPF | Primary Processing Facility | In English | |
| PPF | Payload Processing Facility | In English | |
| PPF | Polar Platform | In English | |
| PPGeo | Progress in Physical Geography | In English | → Serial publications, periodicals → Geography |
| PPHTS | Physical Properties of High Temperature Superconductors | In English | → Serial publications, periodicals → Physics |
| PPI | Plan Position Indicator | In English | |
| PPI | Proposal Preparation Instruction | In English | |
| PPI | Pulse Position Indicator | In English | |
| PPIL | Priced Provisioned Item List | In English | → Maintenance and logistics |
| PPJ | People's Plan Japonesia | In English | |
| PPL | Production Payload | In English | |
| PPL | Priced Parts List | In English | → Maintenance and logistics |
| PPL | Program Parts List | In English | → Maintenance and logistics |
| PPL | Preferred Parts List | In English | → Maintenance and logistics |
| PPL | Planning Parts List | In English | → Maintenance and logistics |
| PPL | Provisioning Parts List | In English | → Maintenance and logistics |
| PPLMN | Periodic Public Land Mobile Network | In English | → Telecommunications |
| PPM | Payload Project Manager | In English | → Management |
| PPM | Pulse Position Modulation | In English | |
| PPM | Perl Package Manager | In English | → Software |
| PPME | Pacific Plate Motion Experiment | In English | |
| PPME | Periodica Polytechnica Mechanical Engineering | In English | → Serial publications, periodicals → Mechanical engineering |
| PPMS | Project Performance Measurement System | In English | |
| PPMtO | Publications of the Purple Mountain Observatory | In English | → Serial publications, periodicals → Astronomy |
| PPN | Physics of Particles and Nuclei | In English | → Serial publications, periodicals → Nuclear, atomic, and molecular physics |
| PPO | Preferred Provider Organization | In English | |
| PPP | Peak Pulse Power | In English | |
| PPP | Payload Patch Panel | In English | |
| PPP | Point-to-Point Protocol | In English | → Networks, communication |
| PPP | Pacific People's Partnership | In English | |
| PPP | Public Private Partnership = PPP | Partenariat Public-Privé | In French |
In English | → Law, jurisprudence → Public administration, government |
| PPP | Point to Point Protocol | In English | |
| PPPC | Professional and Public Policy Committee | In English | |
| PPPL | Princeton Plasma Physics Laboratory (www.pppl.gov) | In English | → Research institutes → Plasma physics |
| PPQIC | Productivity and Product Quality Improvement Council | In English | → Quality management |
| PPR | Program Planning Review | In English | → Management |
| PPR | Payload Preparation Room | In English | |
| PPRB | Preliminary Proposal Review Board | In English | |
| PPS | Printer/Plotter System | In English | |
| PPS | Pulses Per Second | In English | |
| PPS | Primary Propulsion System | In English | → Vehicle engineering |
| PPS | Payload Pointing System | In English | |
| PPS | Pneumatic Power Subsystem | In English | |
| PPS | Partial-Pressure Suit | In English | → Spaceflight engineering, astronautics |
| PPS | Provisioning Performance Schedule | In English | |
| PPS | Product Performance System | In English | |
| PPS | Proceedings of the Physical Society | In English | → Serial publications, periodicals → Physics |
| PPSL | Proceedings of the Physical Society of London | In English | → Serial publications, periodicals → Physics |
| PPSL | Program Parts Selection List | In English | → Maintenance and logistics |
| PPT | Prelaunch Package Test | In English | |
| PPTE | Periodica Polytechnica Transportation Engineering | In English | → Serial publications, periodicals → Vehicle engineering → Transport and postal services |
| PPTEn | Polymer-Plastics Technology and Engineering | In English | → Serial publications, periodicals → Chemical technology → Plastic industry |
| PQA | Procurement Quality Assurance | In English | → 34745 |
| PQC | Procurement Quality Control | In English | → 34745 |
| PQC | Product Quality Council | In English | → Quality management |
| PQE | Procurement Quality Engineering | In English | → 34745 |
| PQE | Progress in Quantum Electronics | In English | → Serial publications, periodicals → Physics → Electronics |
| PQFP | Plastic Quad Flat Pack | In English | → Electronics |
| PQGS | Propellant Quantity Gauging System | In English | → Spaceflight engineering, astronautics |
| PQIC | Productivity and Quality Improvement Council | In English | → Quality management |
| PQIC | Product Quality Improvement Council | In English | → Quality management |
| PQT | Preliminary Qualification Test | In English | |
| PR | Pulse Rate | In English | |
| PR | Procurement Regulation | In English | → 34745 |
| PR | Problem Report | In English | |
| PR | Pressure Regulator | In English | |
| PR | Program Requirement | In English | |
| PR | Purchase Request | In English | → 34745 |
| PR | Performance Report | In English | |
| PR | Position Record | In English | |
| PR | Pressure Ratio | In English | |
| PR | Public Relations = RP | Relations Publiques | In French = RP | Relations Presse | In French |
In English | → Public relations |
| PRA | Participatory Rural Appraisal | In English | → Agricultural sciences |
| PRA | Precession Axis | In English | |
| PRA | Professional Rugby Players Association | In English | → Associations → Football and rugby |
| PrAA | Progress in Astronautics and Aeronautics | In English | → Serial publications, periodicals → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| PRACA | Problem Reporting And Corrective Action | In English | |
| PrAeS | Progress in Aerospace Sciences | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → 6297 |
| PRAI | Pattern Recognition and Artificial Intelligence | In English | → Software |
| PrAst | Practical Astronomy | In English | → Serial publications, periodicals → Astronomy |
| PRB | Program Requirements Baseline | In English | → Management |
| PRB | Program Review Board | In English | → Management |
| PRB | Panel Review Board | In English | |
| PRB | Parachute Refurbishment Building | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| PRCB | Program Requirements Change Board | In English | → Management |
| PRCB | Program Requirements Control Board | In English | → Management |
| PRCB | Program Review Control Board | In English | → Management |
| PRCBD | Program Requirements Control Board Directive | In English | → Management |
| PRCO | Publications of the Riverview College Observatory | In English | → Serial publications, periodicals → Astronomy |
| PRCS | Primary Reaction Control System | In English | |
| PRD | Payload Requirements Document | In English | |
| PRD | Personal Radiation Dosimeter | In English | |
| PRD | Program Requirements Document | In English | → Management |
| PRD | Preliminary Requirements Document | In English | |
| PRD | Procurement Regulation Directive | In English | → 34745 |
| PRD | Procurement Requirements Document | In English | → 34745 |
| PRD | Project Requirements Document | In English | → Management |
| PRDA | Program Research and Development Announcement | In English | → Research policy → Engineering, technology |
| PRDLA | Pacific Rim Digital Library Alliance | In English | → Libraries → Organizations and associations |
|