| CODE | ABBREVIATION |
| P&L | Profit and Loss |
| P&P | Peace and Protection |
| P&S | Publish and Subscribe |
| P.S | Post Scriptum |
| P.S. | Post Scriptum |
| P/AR | Peak-to-Average Radio |
| P/F | Poll / Final bit |
| P/H/A | Phreakers / Hackers / Anarchists |
| PA | Power Alarm / Precision Architecture (RISC) / Program Address / Public Address |
| PAA | Peer Access Approved |
| PABG | Pack a Big Gun |
| PABX | Private Automatic Branch Exchange |
| PAC | Point-And-Click / Pricing and Announcement Committee / Privilege Access Certificate |
| PACCEPT | Presentation Accept |
| PACE | Program for Arrangement of Cables and Equipment |
| PACS | Personal Access Communications System / Picture Archiving and Communication System |
| PACT | Prefix Access Code Translator |
| PAD | Packet Assembler-Disassembler / Packet Assembly/Disassembly |
| PADSX | Partially Automated Digital Signal Cross-Connect |
| PAE | Page Address Extensions / Peer Access Enforcement |
| PAEB | Pan - American EDIFACT Board |
| PAG | Phreaks Against Geeks |
| PAGODA | Profile Alignment Group for Office Document Architecture |
| PAIN | Pirating Artistically Intrepid Newsmongers |
| PAL | Phase Alteration Standard / Phase Alternating Line / Programmable Array Logic |
| PAM | Peachtree Accounting - Macintosh / Pulse Amplitude Modulation |
| PAN | Peripheral Area Network / Personal Account Number |
| PANS | Pretty Advanced New Stuff |
| PAP | Password Authentication Protocol / Practical Applications of Prolog / Printer Access Protocol |
| PAPAG | Phreaks Against Phreaks Against Geeks |
| PAR | Peak-to-Average Ratio / Positive Acknowledgment with Retransmission |
| PARADISE | Piloting A Researcher's Directory Service in Europe |
| PARC | Palo Alto Research Center (Xerox PARC) |
| PAS | Public Announcement Service/System / Public Available Standards / Publicly Available Submitter |
| PASI | Production Availability Shipments |
| PAT | Power Alarm Test |
| PATS | Parameterized Abstract Test Suite |
| PAW | Peachtree Accounting for Windows / Pirates Analyze Warez |
| PAX | Private Automatic Exchange |
| PB | Pacific Brigade |
| PBC | Peripheral Bus Computer / Pipelined Burst Cache / Processor Bus Controller |
| PBD | Pacific Bell Directory |
| PBGA | Plastic Ball Grid Array |
| PBIS | Peachtree Business Internet Suite |
| PBKAC | Problem Between Keyboard and Chair |
| PBM | Product Business Manager |
| PBMS | Pacific Bell Mobile Services |
| PBNI | Pacific Bell Network Integration |
| PBS | Portable Base Station |
| PBT | Profit Before Tax |
| PBU | Product Business Unit |
| PBX | Personal/Private/Product/Public Branch Exchange |
| PC | Personal Computer / Politically correct / Primary Center / Priority Control / Production Control / Protocol Control |
| PCA | Peachtree Complete Accounting / Performance and Coverage Analyzer |
| PCAMI | Personal Computing Asset Management Institute |
| PCB | Printed Circuit Board |
| PCD | Page Cache Disable (pins) |
| PCDA | Program Controlled Data Acquisition |
| PCDOS | Personal Computer Disk Operating System |
| PC-DOS | Personal Computer Disk Operating System |
| PCE | Presentation Connection Endpoint |
| PCEI | Presentation Connection Endpoint Identifier |
| PCEO | Personal Computer Enhancement Operation |
| PCEP | Presentation Connection EndPoint |
| PCFC | Polytechnics and Colleges Funding Councils |
| PCH | Parallel CHannel |
| PCI | Peripheral Component Interconnect / Presentation Context Identifier / Program Controlled Interruption / Personal Computer Interface / Protocol Control Information |
| PCL | Printer Control Language |
| PCM | Plug Compatible Manufacturer / Product Capacity Manager / Profit Contribution Margin / Pulse Code Modulation |
| PCMCIA | People Can't Memorize Computer Industry Acronyms / Personal Computer Memory Card International Association |
| PCN | Personal Communications Networks |
| PCO | Peg Count and Overflow |
| PCO | Point of Control and Observation |
| PCONNECT | Presentation Connect |
| PCP | PC Pursuit / Pyscho Corporate Productions |
| PCPM | Programmable Call Progress Monitoring |
| PCR | Peak Cell Rate / Personal Computer Rats / Post Call Ratio / Program Clock Reference / Personal Communication System / Proxy Cache Server / Personal Communications Services / Personal Conferencing Standard / Plastic Clad Silica |
| PCSA | Personal Computer(ing) System Architecture |
| PCSG | Personal Computing Systems Group |
| PCSN | Private Circuit - Switching Network |
| PCTE | Portable Common Tool Environment |
| PCTR | Protocol Conformance Test Report |
| PCTV | Program Controlled TransVerters |
| PCU | Packet Control Unit |
| PCWG | Personal Conferencing Work Group |
| PCYLIHOONL | Please Cross Your Legs I Have Only One Nail Left |
| PD | Packetization Delay / Peripheral Decoder / Phase-Change - Dual / Physical Delivery / Public domain |
| PDA | Personal Digital Assistant / Public Display of Affection |
| PDAD | Proposed Draft ADdendum |
| PDAM | Proposed Draft AMendment |
| PDAU | Physical Delivery Access Unit |
| PDC | Primary Domain Controller |
| PDES | Product Data Exchange Standard |
| Portable Document File / Portable Document Format / Power Distribution Frame | |
| Printer Definition File | |
| PDH | Plesiochronous Digital Hierarchy |
| PDI | Power and Data Interface |
| PDIF | Product Definition Interchange Format |
| PDISP | Proposed Draft International Standardized Profile |
| PDL | Page Description Language |
| PDM | Pulse Duration Modulation |
| PDN | Public Data Network |
| PDO | Portable Distributed Object |
| PDP | Parallel Data Processor / Peripheral Data Processing / Program Data Processor / Page Directory Pointers |
| PDQ | Pretty Damn(ed) Quick(ly) / Peachtree Data Query |
| PDR | Probe Data Register |
| PDS | Please Don't Shoot / Packet Driver Specification / Parallel Data Structure / Partition DataSet / Premise Distribution System / Planetary Data System / Physical Delivery Service / Planetary Data System / Premises Distribution System / Processor Direct Slot |
| PDSP | Peripheral Data Storage Processor |
| PDTR | Proposed Draft Technical Report |
| PDU | Packet Data Unit / Protocol Data Unit |
| PE | Public Enemy / Peripheral Equipment |
| PEB | PCM Expansion Bus |
| PECC | Product Engineering Control Center |
| PEDI | Protocol for Electronic Data Interchange |
| PEG | Public Educational and Governmental |
| PEL | Picture Element |
| PEM | Privacy Enhanced Mail / Product Error Message |
| PEN | Public Electronic Network |
| PENTIUM | Produces Erroneous Numbers Through Incorrect Understanding of Mathematics |
| PEP | Packet Exchange Protocol / Packetized Ensemble Protocol / Performance Enhancement Package / Personal Enrichment Program / Platform Environment Profile |
| PEPM | Partial Evaluation and semantics-based Program Manipulation |
| PEPY | Presentation Element Parser YACC |
| PER | Packed Encoding Rules |
| PERL | Practical Extraction and Reporting Language |
| PET | Positron Emission Tomography |
| PETS | Parameterized Executable Test Suite |
| PF | Parity Flag / Poll-Final (bit) / Program Function |
| PFA | Page Frame Address / Peachtree First Accounting |
| PFEP | Programmable Front - End Processor |
| PFM | Pure Freaking Magic / Pulse Frequency Modulation |
| PFPU | Processor Frame Power Unit |
| PG | Peripheral Gateway |
| PGA | Pin Grid Array (socket) / Professional Graphics Adapter |
| PGE | Paging Global Extensions |
| PGI | Parameter Group Identifier |
| PGL | Peer Group Leader (ATM Forum) |
| PGP | Pretty Good Privacy |
| PH | Packet Handler / Parity High (bit) |
| PHA | Phreakers/Hackers/Anarchists |
| PHACT | Phreakers/Hackers/Anarchists/Cyberpunks/Technologists |
| PHANTSY | Phantasy Magazine |
| PHD | Phreak/Hacker Destroyers (usually as PhD) |
| PHIGS | Programmer Hierarchical Interactive Graphics System |
| PHUCK | Phone Hackers United Crash Kill |
| PHUK | Phreak/Hack United Kingdom (sometimes as P-H-UK |
| PHUN | Phreaker/Hackers Underground Network |
| PI | Politically Incorrect / Private Investigator / Parameter Identifier / Peripherals Interface / Physical Inventory / Pirate Incorporated / Processing Instruction / Protocol Identifier |
| PIA | Pain in the as* / Peripheral Interface Adapter / Plug-In Administrator / |
| PIC | Politically incorrect / Personal Identification Code / Plastic Insulated Cable / Polyolefin Insulated Cables / Preferred InterExchange Carrier / Primary Inter-exchange Carrier / Primary Independent Carrier / Programmable Interrupt Controller |
| PICS | Platform for Internet Content Selection / Plug-in Inventory Control System / Protocol Implementation Conformance Statement / Prgrammable Interrupt Controller |
| PID | Proprietary Information Disclosure / Protocol IDentifier |
| PIE | Personal Interactive Electronics |
| PIF | Phase Interface Fading / Program Information File / Program Information File (usually as .PIF) / |
| PIFT | Protocol Interbank File Transfer |
| PIG | Product Information Guide |
| PIL | Pirates In Legion |
| PIM | Personal Information Manager / Personal Information Manager / Protocol Independent Multicast |
| PIM | Port Interface Module |
| PIMP | Personal Internet Mail Processor |
| PIN | Personal Identification Number |
| PINE | Program for Internet News and E-mail |
| PING | Packet InterNet Groper |
| PINX | Private Integrated Services Network Exchange |
| PIO | Programmed Input/Output / P Internet Protocol / Packet Interface Port |
| PIPE | Primary Integrated Platform Environment |
| PIR | Probe Instruction Register / Protocol Independent Routing |
| PIRCH | Pathetic IRC CHat |
| PITA | Pain In The Ass |
| PITB | Pain in the butt |
| PITR | Product Inter-operation Test Report |
| PITS | Pie In The Sky |
| PIU | Path Information Unit |
| PIXEL | Picture Element |
| PIXIT | Protocol Implementation Extra Information for Testing |
| PJL | Printer Job Language |
| PKC | Public Key Cryptography |
| PKCS | Public Key Crypto System |
| PKE | Public Key Encryption |
| PKI | Public - Key Infrastructure |
| PL | Parity Low (bit) / Physical Layer / Presentation Layer / Private Line |
| PL/1 | Programming Language / 1 |
| PL/M | Programming Language for Microcomputers |
| PLA | Programmed Logic Array |
| PLB | Picture-Level Benchmark |
| PLCC | Plastic Leaded-Chip Carrier / Plastic Leadless Chip Carrier |
| PLCP | Physical Layer Convergence Procedure |
| PLCP | Physical Layer Convergence Protocol |
| PLD | Phase Lock Demodulator / Programmable Logic Device |
| PLDI | Programming Language Design and Implementation |
| PLE | Public Local Exchange |
| PLILP | Programming Language Implementations Logics and Prog |
| PLL | Phase Locked Loop |
| PLOKTA | Press Lots Of Keys To Abort |
| PLOU | Physical Layer Overhead Unit |
| PLP | Packet Layer Protocol/Procedure / Packet Level Procedure |
| PLS | Please / Physical Layer Signaling / Programmable Logic Sequencer |
| PLSAP | Physical Layer Service Access Point |
| PLU | Primary Logical Unit |
| PLV | Production-Level Video |
| PM | Pardon Me / Performance Management / Peripheral Module / Phase Modulation / Physical Medium / Plant Management / Private Message / Protocol Machine |
| PMA | Performance Measurement Analysis / Physical Medium Attachment |
| PMAC | Packet Media Access Controller / Peripheral Module Access Controller |
| PMBI | Pardon my butting in |
| PMBX | Private Manual Branch Exchange |
| PMCR | Probe Mode Control Register |
| PMD | Physical Medium Dependent (Sublayer) / PostMaster Daemon (usually as pmd) |
| PMETC | Pardon Me etc. |
| PMFBI | Pardon Me For Butting In |
| PMFJI | Pardon Me For Jumping In |
| PMG | Product Marketing Group |
| PMI | Physical Medium Independent (Sublayer) / Private Memory Interconnect |
| PMIGBOM | Put Mind In Gear Before Opening Mouth |
| PMJI | Pardon My Jumping In / Pardon me Jumping in |
| PMMU | Paged Memory Management Unit |
| PMN | Performance Monitoring |
| PMOS | Pisitive-channel Metal Oxide Semiconductor |
| PMP | Peed My Pants / Point to MultiPoint |
| PMR | Poor Mans Routing |
| PMS | Pantone Matching System / Paranoid Media Scrutinization / Peoples Message Service / Public Message Service |
| PMT | Packet-Mode Terminal / Planning Methodology Team |
| PMU | Precision Measurement Unit |
| PMX | Packet Multiplexer / Private Message Exchange |
| PMYMHMMFSWGAD | Pardon Me You Must Have Mistaken Me for Someone Who Gives A Damn |
| PN | Personal Name / Positive Notification |
| PNA | Private Network Adapter |
| PNB | Pacific Northwest Bell |
| PNC | Personal Number Calling |
| PND | Present Next Digit |
| PNG | Portable Network Graphics |
| PNIC | Private Network Identification Code |
| PNNI | Private Network to Network Interface / Private Network-Node Interface |
| PNO | Public Network Operator |
| PNP | Plug aNd Play / Plug N Play (usually as PnP) |
| PNPN | Positive-Negative-Positive-Negative (devices) |
| PO | Purchase Order |
| POA | Power Open Association / Power of Attorney |
| POAC | Probe Origin Authentication Check |
| POAHF | Put On A Happy Face |
| POB | Peripheral Order Buffer |
| POC | Point of Contact |
| POCE | Pantone Open Color Environment |
| POD | Piece Of Data |
| PODC | Principles Of Distributed Computing |
| POF | Programmable Operator Facility |
| POH | Path OverHead / Power On Hours |
| POI | Point Overhead Indicator |
| POM | Point of Manufacturing |
| PON | Passive Optical Network |
| PONSI | Program On Non-collegiate Sponsored Instruction |
| POOR | Protectors Of Our Rights |
| POP | Point Of Presence / Post Office Protocol / Programmable Option Select |
| POP3 | Post Office Protocol version 3 |
| POPL | Principles Of Programming Languages |
| POPs | Points of Prescence (points of local access to the net) |
| POQ | Pis* Off Quickly |
| POQADCB | Pis* Off Quickly and Don't Come back |
| POS | Point Of Sale / Programmable Option Select |
| POSC | Petrotechnical Open Software Corporation |
| POSI | Promoting OSI |
| POSIX | Portable Operating System Interface eXtension |
| POSSLQ | Person of Opposite Sex Sharing Living Quarters |
| POST | Power On - Self Test |
| POT | Point Of Termination |
| POTS | Plain Old Telephone Service |
| POV | Point of view |
| PP | Parallel Port / Post Pay / Pre Pay |
| PP&E | Production Planning and Execution |
| PPA | Privacy Protection Act / Professional Prepress Alliance |
| PPARC | Particle Physics and Astronomy Research Council |
| PPC | Program - to - Program Communication / Peer - to - Pee |
| PPCI | Presentation Protocol Control Information |
| PPD | Peripheral Pulse Distributor / Post Script Printer Description / Post-Script Printer Description / Product Phase Down / Presentation Protocol Data Unit |
| PPI | Pixels Per Inch (usually as ppi) / Programmable Peripheral Interface |
| PPIC | Phose-Phree-Inner-Circle |
| PPL | PeoPLe / Periodic Payment License |
| PPM | Pages Per Minute (usually ppm) / Pages Per Month / Parts Per Million / Presentation Protocol Machine / Principal Period Maintenance / Pulse Position Modulation |
| PPN | Private Packet Network / Programmer Project Number; now known as ID# or UserId / Project Program Number / Public Packet Switching |
| PPOPP | Principles and Practice Of Parallel Programming |
| PPP | Petty Pet Peeve / Point to Point Protocol |
| PPP/MP | Point-to-Point Protocol/Multilink Protocol |
| PPPMP | Point-to-Point Protocol Multilink Protocol |
| PPQN | Pulses Per Quarter-Note (MIDI) |
| PPS | Packets Per Second / Product Performance Surveys / Public Packet Switching / Public Packet Switching Network / Pulses Per Second |
| PPSDN | Public Packet - Switched Data Network |
| PPSN | Public Packet - Switched Network |
| PPSU | Personal Printer Spooling Utility |
| PPTM | Protocol Profile Testing Methodology |
| PPTP | Point-to-Point Tunneling Protocol |
| PQFP | Plastic Quad Flat Pack (socket) |
| PR | Prepare / Path Replacement |
| PRA | Parabolic Reflector Antenna / Primary Rate Access |
| PRAM | Parallel Random Access Memory / Programmable Random Access Memory / Parameter Random Access Memory |
| PRB | Packet Receive Buffer |
| PRCA | Puerto Rico Communications Authority |
| PRDMD | Private Directory Management Domain |
| PRE | Prefix |
| PREFUSE | Presentation Refuse |
| PREMIS | PREMises Information System |
| PREVIS | Previsualization |
| PRG | Purge |
| PRI | (ISDN) Primary Rate Interface / Primary Rate Interface |
| PRID | PRotocol IDentifier |
| PRIMOS | Prime Operating System |
| PRM | Protocol Reference Model |
| PRMD | Private Mail Domain / Private Management Domain |
| PRML | Partial Response - Maximum Likelihood |
| PRN | Printer |
| PROFS | PRofessional OFfice System |
| PROGRES | PROgramming with Graph REwriting Systems |
| PROLOG | PROgramming in LOGic (programming language) |
| PROM | Programmable Read-Only Memory |
| PROMATS | PROgrammable MAgnetic Tape System |
| PROMIS | Prosecutors Management Information Systems |
| PROTEL | PRocedure Oriented Type Enforcing Language |
| PRS | Personal Response System |
| PRTC | Puerto Rico Telephone Company |
| PRTM | Printing Response Time Monitor |
| PRTSC | Print Screen (usually as PrtSc) |
| PRW | Peachtree Report Writer |
| PS | Personal System / Physical Sequence / Programmed Symbols / Physical Sequential / Post Scriptum / PostScript / Preferred Service / Presentation Service / Print Server / Program Store / Proposed Standard |
| PS/2 | Personal System/2 |
| PSAP | Presentation Service Access Point / Public Safety Answering Point (911) |
| PSC | Peachtree Support Center / Prime Service Contractor / Print Server Control / Protection Switching Circuit / Public Safety Calling system / Public Service Commission |
| PSD | Power Spectral Density |
| PSDC | Public Switched Digital Capability |
| PSDN | Packet-Switched Data Network / Public Switched Data Network |
| PSDS | Public Switched Digital Service |
| PSDU | Presentation Service Data Unit |
| PSE | Packet Switch Exchange / Page Size Extension / Power Series Expansion |
| PSEC | Picosecond (one trillionth of a second) |
| PSEL | Presentation Selector |
| PSF | Permanent Swap File |
| PSG | Peripheral and Supplies Group / Product Shipping Guide |
| PSH | Push (flag) |
| PSI | Packet Switching Interface / Performance Summary Interval / Performance Systems International / Pounds per Square Inch / Process to Support Interoperability / Programmable Serial Interface |
| PSIU | Packet Switch Interface Unit |
| PSK | Phase-Shift Keying |
| PSM | (SQL) Persistent Stored Modules / Packet Service Module / Phase Shift Modulation / Position Switching Module |
| PSN | Packet Switched Network / Packet Switching Node / Public Switched Network |
| PSO | Pending Service Order |
| PSP | Presentation Services Process |
| PSPDN | Packet Switched Public Data Network |
| PSR | Probe Status Register |
| PSRAM | Pseudo-Static Random Access Memory |
| PSRG | Privacy and Security Research Group |
| PSS | Packet Switch Stream / Packet Switched Services / Performance Support Systems / Professional Software Services |
| PSS1 | Private Signalling System 1 |
| PST | Pre-Structured Technology (development process) |
| PSTN | Public Switched Telephone Network |
| PSU | Portable Storage Unit / Program Storage Unit / Power Supply Unit |
| PSW | Program Status Word |
| PT | Pass Through / Payload Type / Please Token / Program Timer |
| PTA | Personal Telecommunications Assistant |
| PTAN | Performance Testing Alliance for Networks |
| PTAT | Private Trans Atlantic Telecommunications |
| PTB | Powers that be |
| PTC | Part Time Crackers / Public Telephone Companies |
| PTE | Packet Transport Equipment / Path Terminating Entity / Path Terminating Equipment |
| PTG | Physical Technology Group |
| PTI | Payload Type Identifier |
| PTL | Pirates That Live / Praise The Lord |
| PTM | Pulse Time Modulation |
| PTMM | Please Tell Me More |
| PTN | Personal Telecommunications Number |
| PTNX | Private Telecommunications Network eXchange |
| PTO | Public Telecommunication network Operator / Public Telephone Operator |
| PTP | Peer-To-Peer / Point-To-Point |
| PTR | Pointer |
| PTS | Position and Trunk Scanner / Profile Test Specification |
| PTSE | PNNI Topology State Element (ATM Forum) |
| PTSP | PNNI Topology State Packet |
| PTT | Postal Telegraph and Telephone / Postal Telephone and Telegraph |
| PTTXAU | Public TeleTex Access Unit |
| PTW | Primary Translation Word |
| PTXAU | Public Telex Access Unit |
| PU | Physical Unit |
| PUC | Peripheral Unit Controller / Public Utilities Commission / Public Utility Commission |
| PUCP | Physical Unit Control Point |
| PUN | Physical Unit Number |
| PUP | PARC Universal Packet (protocol) |
| PV | Parameter Value |
| PVC | Permanent Virtual Channel / Permanent Virtual Circuit(s) / Permanent Virtual Connection / Permanent Virtual Connections / Polyvinyl Chloride |
| PVCC | Permanent Virtual Channel Connection |
| PVI | Protected mode Vrtual Interrupts |
| PVM | Parallel Virtual Machine |
| PVN | Private Virtual Network |
| PVPC | Permanent Virutal Path Connection |
| PVT | Permanent Virtual Terminal |
| PWA | Pirates With Attitude |
| PWD | Present Working Directory (UNIX Command) |
| PWI | Public Windows Interface |
| PWM | Pulse Width Modulation |
| PWS | Peer Web Services |
| PWT | Page Write - Through (pins) |
| PXP | Packet eXchange Protocol |
P
PACS :- Primary Agricultural Credit Society
PAFNA :- Pan African News Agency
PATA :- Pacific Asia Travel Association
PCI :- Press Council of India
PCS :- Provincial Civil Services
PEO :- Programme Evaluation Organization
Ph.D. :- Doctor of Philosophy
PIB :- Press Information Bureau
PIN :- Postal Index Number
PIOC :- Persons of Indian Origin Card
PGIMR :- Post Graduate Institute of Medical Research
PLA :- Peoples Liberation Army
PLO :- Palestine Liberation Organization
PLOTE :- Peoples Liberation Organization of Tamil Elam
PMSSY :- Pradhan Mantari Swasthya Suraksha Yojna
PM :- Post Meridian / Prime Minister
PMLA :- Peoples Movement for Liberation of Angola
PNR :- Passanger Numerical Record
POTA :- Prevention of Terrorism Act
PSLV :- Polar Satellite Launch Vehicle
PSI :- Population Service International
PTI :- Press Trust of India
PTO :- Please Turn Over
PTCT :- Parents to Child Transmission
PUCC :- Pollution Under Control Certificate
PUCL :- Peoples Union for Civil Liberties
PUDR :- Peoples Union for Democratic Rights
PVC :- Poly Vinyl Chloride / Param Vir Chakra
PVSM :- Param Vishist Seva Medal
PWD :- Public Works Department
PWG :- Peoples War Group
