@c Syntax:
@c ACRONYM
@c Expansion[ (Reference)][, "Style"]
@c Additional explanations are included in [square brackets]

@table @asis
@item P2P
Peer to Peer [net]

@item PA
Precision Architecture (HP)

@item PABX
Private Automatic Branch eXchange

@item PAC
Privilege Attribute Certificate (DCE)

@item PACE
Priority Access Control Enabled (3Com, ethernet)

@item PACER
Public Access to Court Electronic Records

@item PACS
Picture Archiving and Communications Systems

@item PACS
Public-Access Computing Systems

@item PACT
Partnership in Advanced Computing Technologies (org. UK)

@item PACT
Personal Air Communications Technology, "pACT"

@item PACT
Production Analyses Control Technique

@item PACX
Private Automatic Computer eXchange

@item PAD
Packet Assembling Disassembling (CCITT, X.3, X.28, X.29, PSDN)

@item PADS
Programmer's Advanced Debuging System

@item PAEB
Pan American EDIFACT Board (UN/EDIFACT)

@item PAEB
Pan American EDIFACT Board (org., EDIFACT), "PA/EB"

@item PAI
Process After Input (R/3)

@item PAL
Paradox Application Language (Borland, DB)

@item PAL
Phase Alternating Line

@item PAL
Privileged Architecture Library (DEC, Alpha)

@item PAL
Programmable Array Logic

@item PAM
Paging Area Memory

@item PAM
Pluggable Authentication Module (Linux, LISA)

@item PAM
Primary Access Method (BS2000)

@item PAM
Programmable Attribute Maps (DRAM, PCI)

@item PAM
Pulse Amplification Modulation

@item PAML
Publicly Accessible Mailing Lists (Internet, BBS)

@item PAN
Personal Account Number

@item PANIX
Public Access internet/uNIX [system] (Unix, Internet, network)

@item PAP
Password Authentication Protocol (RFC 1334)

@item PAP
Printer Access Protocol (AppleTalk)

@item PAP
ProgrammAblaufPlan (DIN 66001)

@item PAPI
PC voice API (API)

@item PAR
Positive Acknowledgement with Retransmission [protocols]

@item PAR
Project Authorization Request (IEEE)

@item PARC
Palo Alto Research Center (org., USA, Xerox)

@item PARLE
[conference on] Parallel ARchitecture and Languages Europe (ECRC, conference)

@item PARTS
Parts Assembly and Reuse Tool Set (Visual Smalltalk)

@item PAS
Publicly Available Specifications (ISO)

@item PAS2
Personal Application System /2 (IBM, DB2/2), "PAS/2"

@item PASC
Portable Application Standards Committee (org., IEEE)

@item PAT
Port and Address Translation (IOS, Cisco, LAN, IP)

@item PAX
Pixel Addressing eXtensions (Intel, RISC, CPU)

@item PAX
Portable Archive eXchange (SCO, Unix)

@item PAX
Private Automatic eXchange

@item PB
Pipeline Burst [cache]

@item PBC
Peripheral Bus Computer

@item PBE
Prompt By Example

@item PBI
Pacific Bell Internet (ISP)

@item PBI
Phone Based Interface

@item PBM
Play By Mail [game]

@item PBO
Process Before Output (R/3)

@item PBX
Private Branch eXchange (Nebenstellenanlage)

@item PC
Personal Computer

@item PC
Printed Circuit (IC)

@item PC
Priority Control

@item PC
Protocol Control

@item PC
Punched Card

@item PC97
Personal Computer 97 (MS), "PC 97"

@item PCA
Policy Certification Authority (DFN, PGP)

@item PCA
Power Calibration Area (CD)

@item PCAT
Personal Computer - Advanced Technology, "PC-AT"

@item PCB
Printed Circuit Board

@item PCB
Process Control Block (BS2000)

@item PCB
Protocol Control Block (TCP)

@item PCC
Portable C Compiler

@item PCCA
Personal Computer Communications Associations (org., USA)

@item PCD
Photo CD (Kodak, CD)

@item PCD
Process Control Device

@item PCDA
Program Controlled Data Acquisition

@item PCDOS
Personal Computer DOS (OS), "PC-DOS" 

@item PCERT
Purdue Computer Emergency Response Team

@item PCF
Portable Compiled Font

@item PCH
Paging CHannel (GSM, CCCH)

@item PCI
Peripheral Component Interconnect

@item PCI
Protocol Control Information (OSI, ETSI)

@item PCIA
Personal Communications Industry Association (org., USA, SMS)

@item PCIS
Portable Common Interface Set

@item PCIXF
Personal Computer Integrated eXchange Format (OS/2), "PC/IXF"

@item PCL
Portable Common LOOPS (CLOS)

@item PCL
Printer Control Language (HP)

@item PCL
Programmable Command Language (CMU, DEC, TOPS)

@item PCM
Personal Computer Manufacturer

@item PCM
Physical Connection Management (FDDI, SMT)

@item PCM
Plug Compatible Machine

@item PCM
Pulse Coded Modulation

@item PCMCIA
People Can't Memorize Computer Industries Acronyms (slang)

@item PCMCIA
Personal Computer Memory Card International Association (org.)

@item PCMS
Project & Configuration Management System

@item PCMT
Personal Computer Message Terminal

@item PCN
Personal Communications Network

@item PCN
Public Communications Network (Mobile Systems)

@item PCNFS
Personal Computer Network File System

@item PCO
Point of Control and Observation (ISO 9646-1, IUT)

@item PCPC
Personal Computers Peripheral Corporation

@item PCR
Peak Cell Rate (UNI, ATM, SCR)

@item PCR
Processor Configuration Register (Motorola, CPU)

@item PCR
Program Clock Reference

@item PCRW
Phase Change ReWritable (DVD, EMCA), "PC-RW"

@item PCS
Personal Communication System (Sony, Panasonic, Motorola)

@item PCS
Personal Communications Services

@item PCS
Programmable Communications Subsystem

@item PCS
Punched Card System (PC)

@item PCSA
Personal Computing Systems Architecture [= Pathworks] (DEC, NOS)

@item PCSD
Printer Control Sequence Description

@item PCSI
Pacific Communication Sciences, Inc. (manufacturer)

@item PCT
Private Communication Technology (Internet, MS, Visa)

@item PCT
Probe Control Table (FFST/2)

@item PCTCP
Personal Computer/Transmission Control Protocol, "PC/TCP" 

@item PCTE
Portable Common Tool Environment (CASE, ESPRIT)

@item PCTS
POSIX Compliance Test Suite (POSIX)

@item PCV
P-bit Coding Violation [error event] (DS3/E3)

@item PCV
Path Coding Violation [error event] (DS1/E1)

@item PCXT
Personal Computer - eXtended Technology, "PC-XT"

@item PD
Packetization Delay

@item PD
Plug & Display [standard] (LCD, VESA), "P&D"

@item PD
Public DOMAIN

@item PDA
Personal Digital Assistant

@item PDC
Power Disk Cartridge (ECMA)

@item PDC
Primary DOMAIN Controller (MS, Windows NT)

@item PDC
PROLOG Development Center (manufacturer, Denmark, PROLOG)

@item PDE
Partial Differential Equation

@item PDES
Product Data / Definition Exchange Standards (USA, STEP, CIM)

@item PDF
Portable Document Format (Adobe)

@item PDF
Program Development Facility (IBM)

@item PDH
Plesiochronous Digital Hierarchy (ATM)

@item PDI
Power and Data Interface

@item PDL
Page / Program Description / Design Language

@item PDL
PERL Data Language (PERL)

@item PDL
Program Development Language

@item PDM
Program Development Manager (IBM, ADT)

@item PDN
Programmer's Distribution Network (Fido)

@item PDN
Public Data Network (Mobile Systems)

@item PDO
Portable Distributed Objects (NeXT)

@item PDOS
Parallel and Distributed Operating System (OS, MIT)

@item PDP
Parallel Distributed Processing (AI)

@item PDP
Peripheral Data Processing

@item PDP
Plasma Display Panel

@item PDP
Programmable Data Processor (DEC)

@item PDQ
Parallel Data Query (Informix, DB)

@item PDS
Partitioned Data Set

@item PDS
Portable Display Shell (Shell)

@item PDS
Processor Direct Slot / Socket (Motorola, Apple)

@item PDS
Professional Development System (MS)

@item PDS
Public DOMAIN Software (PD)

@item PDSP
Peripheral Data Storage Processor

@item PDSS
Post Development and Software Support

@item PDT
Pacific Daylight Time [-0700] (TZ, PST, USA)

@item PDTR
Proposed Draft Technical Report

@item PDU
Packet Data Unit

@item PDU
Product Development Unit

@item PDU
Protocol Data Unit (OSI)

@item PDV
Photorealistic Data Visualization

@item PDV
ProzessDatenVerarbeitung

@item PE
Phase Encoding

@item PE
Portable eXecutable (Win32)

@item PE
Processing Element (MPP)

@item PEA
Pocket Ethernet Adapter (LAN, ethernet)

@item PEARL
Process and Experiment Automation Realtime Language

@item PEBCAK
Problem Exists Between Chair And Keyboard (slang)

@item PEC
Program Execution Control (IBM, OS/2)

@item PEDS
Planning, programming, budget, and execution Electronic Delivery System

@item PEEK
Partners Early Experience Kit (Taligent)

@item PEL
Picture ELement

@item PEM
Privacy Enhanced Mail (PSRG, RFC 1421/1422/1423/1424)

@item PEN
Public Education Network

@item PEP
Packetized Ensemble Protocol (Telebit)

@item PEP
Personal Exam Prep (MS, ATEC)

@item PER
Packed Encoding Rules (ASN.1)

@item PER
Program Event Recording

@item PERL
Pathologically Eclectic Rubbish Lister (slang)

@item PERL
Practical Extraction and Report Language (PERL)

@item PERM
Pre-Embossed Rigid Magnetic (Sony, HDD)

@item PERMIS
PERManentes InventurabwicklungsSystem (MBAG)

@item PEROM
Programmable Erasable Read Only Memory (IC)

@item PERT
Program Evaluation / Evolution and Review Technique

@item PES
P-bit Errored Seconds (DS3/E3)

@item PES
Photo-Electric Scanning (DTP)

@item PES
Programmed Electrical Stimulation

@item PES
Proposed Encryption Standard

@item PEST
Parameter Estimation by Sequential Testing

@item PET
Personal Electronic Translator

@item PET
Print Enhancement Technology (Compaq)

@item PET
Progressive Educational Technology

@item PEX
PHIGS Extension for X (X-Windows, PHIGS)

@item PFA
Parameter Field Address (Forth)

@item PFA
Predictive Failure Analysis (HDD)

@item PFC
Protocol Field Compression (PPP)

@item PFE
Page Fault Error (Windows, MS)

@item PFK
Program Function Key

@item PFM
Printer Font Metrics (Adobe)

@item PFPU
Processor Frame Power Unit

@item PFR
Portable Font Resource (Netscape)

@item PGA
Pin Grid Array (IC, CPU)

@item PGA
Professional Graphics Adapter (IBM)

@item PGC
Professional Graphics Controller

@item PGFNA
Prince George Free-Net Association (org., USA)

@item PGI
Parameter Group Identifier (SPDU)

@item PGML
Precision Graphics Markup Language (XML, IBM, Netscape, Sun, Adobe)

@item PGP
Pretty Good Privacy

@item PGS
Program Generation System

@item PHIGS
Programmer's Hierarchical Interactive Graphics System

@item PHIGSPLUS
PHIGS Plus Lumiere and Surfaces (PHIGS), "PHIGS-PLUS"

@item PHIPS
Professional High-Resolution Image Processing System (CA)

@item PHOTON
paneuropean PHOtonic Transport Overlay Network (ACTS)

@item PHP
PHP Hypettext Preprocessor (PHP/FI, HTML, CGI, successorr)

@item PHPFI
Personal Home Page [construction kit]/Form Interpreter (HTML, CGI, PHP, Verlaeufer), "PHP/FI"

@item PHUN
Phreakers and Hackers Underground Network (network)

@item PHY
PHYsical Layer Control (FDDI)

@item PI
Placement and Interconnect [system] (VLSI, MIT)

@item PIA
Peripheral Interface Adapter

@item PIA
Plug-In Administrator

@item PIC
Personal Intelligent Communicator

@item PIC
Point in Call (IN)

@item PIC
Primary Independent Carrier

@item PIC
Priority Interrupt Controller (IC)

@item PIC
Programmable Interrupt Controller

@item PICG
PCTE Interface Control Group (org., PCTE)

@item PICS
Platform for Internet Content Selection (org., Internet)

@item PICS
Plug-in Inventory Control System

@item PICS
Protocol Implementation Conformance Statements

@item PICSDCPR
PICS Detailed Continuing Property Record, "PICS/DCPR"

@item PICU
Priority Interrupt Control Unit

@item PID
Process IDentification number (Unix)

@item PID
Protocol IDentifier [governing connection types]

@item PIE
Personal Interactive Electronics [division] (Apple)

@item PIG
Psion Interest Group (Psion)

@item PIIX
PCI IDE/ISA Xcelerator (Intel IC)

@item PIM
Parallel Inference Machine (FGCS, AI)

@item PIM
Personal Information Manager

@item PIM
Protocol Independent Multicast

@item PIMB
PCTE Interface Management Board (org., PCTE)

@item PIMF
Paar [kabel] In MetallFolie (VDE, STP), "PiMF"

@item PIMS
Project Information Management System

@item PIN
Personal Identification Number (banking)

@item PIN
Processor Independent Netware (Novell, HP, DEC, Apple, Sun)

@item PINE
Program for Internet News and Email / PINE Is No longer ELM

@item PINET
Physicians Information NETwork (network, USA)

@item PING
Packet InterNet Groper (ICMP, TCP/IP)

@item PIO
Parallel / Programmed Input/Output

@item PIOS
Personen, Institutionen, Objekte, Sachen (INPOL)

@item PIP
Packet Interface Port

@item PIP
Paper Impact Printing

@item PIP
Periphal Interchange Program

@item PIP
Peripheral Interchange Program

@item PIP
Personal Information Processor

@item PIP
Picture In Picture (Video)

@item PIP
Plug-In Protocol (ZOC)

@item PIPS
Parallel Information Processing System (GNU)

@item PIPS
Pattern Information Processing Systems

@item PIRA
Printing Industries Research Association (org.)

@item PISA
Portable InformationsSystem Architecture (DB, infodas, PISA)

@item PISABG
PISA/Business Graphics (PISA), "PISA/BG"

@item PISADB
PISA/Data Base (PISA, DB), "PISA/DB"

@item PISADD
PISA/Data Dictionary (PISA), "PISA/DD"

@item PISADK
PISA/ ??? (PISA), "PISA/DK"

@item PISAMP
PISA/Menue Processor (PISA), "PISA/MP"

@item PISANT
PISA/ ??? (PISA), "PISA/NT"

@item PISAPPS
PISA/ProduktionsPlanung und -Steuerungssystem (PISA), "PISA/PPS"

@item PISAQL
PISA/Query Language (PISA), "PISA/QL"

@item PISARG
PISA/Report Generator (PISA), "PISA/RG"

@item PISW
Process Interrupt Status Word (CPU, assembler)

@item PIT
Programmable Interval Timer

@item PITA
Pain In The Anatomy / As (slang, Usenet, IRC)

@item PIU
Path Information Unit (IBM, SNA)

@item PIU
Plug-In Unit

@item PIXEL
PIcture ELement

@item PIXIT
Protocol Implementation eXtra Information for Testing

@item PKCS
Public Key Cryptography Standards (org., USA, cryptography)

@item PKS
Polizeiliche KriminalStatistik (INPOL)

@item PL
Physical Layer (ISO, OSI)

@item PL1
Programming Language no. 1 (DEC), "PL/1"

@item PLA
Programmable Logic Array

@item PLATO
Programmed Logic for Automated Teaching Operations

@item PLB
Picture Level Benchmark (GPC)

@item PLBSI
Picture Level Benchmark Sample Implementation (GPC)

@item PLC
Programmable Logic Controller (IC)

@item PLCC
Plastic Leadless Chip Carrier

@item PLCP
Physical Layer Convergence Procedure / Protocol (UNI, DS-3)

@item PLD
Programmable Logic Device (IC)

@item PLDM
Power Line Disturbance Monitor

@item PLIP
Parallel Line Internet Protocol (IP), "PL/IP" 

@item PLL
Phase Locked Loop

@item PLM
Programming Language for Microcomputers

@item PLMN
Public Land Mobile Network (Mobile Systems, GSM)

@item PLOU
Physical Layer Overhead Unit (UNI), "PL-OU"

@item PLP
Packet Layer Protocol (X.25)

@item PLP
Party Line Protocol

@item PLP
Presentation Level Protocol

@item PLS
Personal Library Systems (manufacturer)

@item PLS
PhysicaL Signaling

@item PLS
Programmable Logic Sequencer

@item PLV
Presentation Level Video (DVI, Intel)

@item PM
Performance Management

@item PM
Peripheral Module

@item PM
Physical Medium

@item PM
Presentation Manager (OS/2)

@item PM
Protected Mode (Intel, CPU)

@item PMA
Physical Medium Attachment

@item PMA
Policy Management Architecture (Netmanage, Internet)

@item PMA
Program Memory Area (CD)

@item PMAC
Packet Media Access Control (FDDI), "P-MAC"

@item PMAC
Peripheral Module Access Controller

@item PMC
Pseudo-Machine Code

@item PMD
Physical layer, Medium Dependant [sub-layer] (FDDI, UNI)

@item PMDRAM
Page Mode Dynamic Random Access Memory (RAM, DRAM, IC), "PM-DRAM"

@item PME
Pattern Matching Engine

@item PMJI
Pardon Me for Jumping In (slang)

@item PMMU
Paged Memory Management Unit

@item PMOS
Positive-channel Metal Oxide Semiconductor (IC)

@item PMP
Point to MultiPoint (UNI)

@item PMP
Preventive Maintenance Package (AIX, IBM)

@item PMR
Poor Man's Routing

@item PMR
Problem Management Report (IBM)

@item PMS
Personal Mailing System

@item PMS
Processor Memory Switch

@item PMS
Project Management System

@item PMS
Public Message System

@item PMSP
Preliminary Message Security Protocol

@item PMU
PowerMeter Unit

@item PMW
Project Manager Workbench

@item PMX
Packet MultipleXer (MUX)

@item PMX
Presentation Manager for the X window system, "PM/X" 

@item PNG
Portable Network Graphics [format] (RFC 2083)

@item PNNI
[phase 0] Public Network Node Interface [protocol] (ATM)

@item PNNI
Private Network to Network Interface (ATM), "P-NNI"

@item PNP
Plug 'N Play (PNP), "PnP"

@item PNPBIOS
Plug and Play Basic Input Output System (PNP, BIOS), "PnP BIOS"

@item PNPN
Positive Negative Positive Negative [devices]

@item PNS
PeaceNet Sweden (network)

@item PNW
Personal NetWare (Novell, Netware)

@item POACH
PC-On-A-Chip (PC)

@item POC
Proof of Concept

@item POCSAG
Post Office Code Standard Advisory Group (org., SMS)

@item POD
Plain Old Document [format]

@item PODA
Piloting of ODA (ESPRIT, SNI, Bull, TITN, ICL, Olivetti, ODA)

@item PODA
Priority Orientated Demand Assignment (MAC, TDM)

@item POE
PowerOpen Association (Apple, IBM, Motorola, ..., org.)

@item POEM
Portable Object-orientated Entity Manager (SGML)

@item POEMS
Platinum Open Enterprise Management System

@item POEP
Primary Operand Execution Pipeline (Motorola, CPU), "pOEP"

@item POF
Plastic Optical Fiber (OWG)

@item POGO
Programmer-Oriented Graphics Operation

@item POH
Path OverHead (SONET)

@item POI
Path Overhead Indicator (SONET)

@item POI
Point Of Information

@item POI
Point Of Interaction (IN)

@item POL
Problem / Procedure / Process Oriented Language

@item POOL
Parallel Object Orientated Language (DOOM, OOP)

@item POP
Package for Online Programming

@item POP
Point Of Presence (Internet, ISP)

@item POP3
Post Office Protocol 3 (Internet, RFC 1939)

@item POR
Point Of Return (IN)

@item POR
Power-On Reset (BIOS)

@item POS
Primary Operating System (OS)

@item POS
Programmable Object Select

@item POSI
Promoting conference for OSI (Japan, org., conference)

@item POSIX
Portable Operating System for unIX (OS, IEEE 1003, ISO 9945, PASC, Unix)

@item POST
Power-On Self-Test

@item POSYBL
PrOgramming SYstem for distriButed appLications

@item POTS
Plain Old Telephone System (slang, Usenet, IRC)

@item POV
Persistence of Vision (raytracing)

@item POWER
Power Optimization With Enhanced RISC [chip] (IBM, Apple, Motorola)

@item PP
Physical Partition (LVM)

@item PP
Physical Plane (IN)

@item PP
Pre-Processor

@item PPA
Parallel Port Adapter

@item PPC
PowerPC (Apple)

@item PPC
Program to Program Communication (Apple)

@item PPDS
Personal Printer Data Stream

@item PPDU
Presentation Protocol Data Unit (PDU, OSI, ISO 8823, OSI/RM)

@item PPE
Packet Processing Engine (Hub)

@item PPGA
Plastic Pin Grid Array (CPU)

@item PPI
Parallel Port Interface

@item PPI
Pixels Per Inch

@item PPI
Programmable Peripheral Interface

@item PPID
Parent Process IDentification number (Unix)

@item PPL
Pcboard Programming Language (BBS)

@item PPL
Polymorphic Programming Language (Harvard, Xerox, PARC)

@item PPM
Pages Per Minute

@item PPM
Pulse Position Modulation (MMVF)

@item PPMS
Professional Productivity Management System

@item PPN
Project Programmer Number

@item PPN
Public Packet Switching

@item PPOP
Plain Paper Optimized Printing (Canon), "P-POP"

@item PPP
Point-to-Point Protocol (Internet, PPP, RFC 1171/1661)

@item PPS
Packets Per Second

@item PPS
Parallel Processing System

@item PPS
ProduktionsPlanung und -Steuerung

@item PPS
Public Packet Switching [network]

@item PPSN
Public Packet-Switched Network

@item PPSU
Personal Printer Spooling Utility

@item PPTP
Point-to-Point Tunneling Protocol (MS, Ascend, IP)

@item PPU
Peripheral Processing Unit

@item PQET
Print Quality Enhancement Technology (Lexmark)

@item PQFP
Plastic Quad Flat Package (CPU)

@item PR
Packet Radio

@item PR
Pattern Recognition

@item PR
Pentium Rating (AMD)

@item PRACSA
Public Remote-Access Computer Standards Association (org., USA)

@item PRAM
Parameter Random Access Memory (RAM, IC, Apple), "P-RAM"

@item PRCS
Project Revision Control System (GNU)

@item PREP
PowerPC REferenz Plattform (IBM, Apple), "PReP"

@item PREPNET
Pennsylvania Research and Economic Partnership NETwork (network, USA), "PREPnet"

@item PRF
Problem Report Form (IBM)

@item PRI
Primary Rate Interface (ISDN)

@item PRIDE
PRofitable Information by DEsign (IRM)

@item PRISM
Parallel Reduced Instruction Set Multiprocessing

@item PRISM
PRogrammed Integrated System Maintenance

@item PRMD
PRivate Management DOMAIN (X.400, MHS)

@item PRML
Partial Response - Maximum Likelihood (HDD)

@item PRN
Pseudo Random Noise [code] (GPS)

@item PRNG
Pseudo Random Numer Generator

@item PRO
Precision RISC Organization (org.)

@item PROFIBUS
PROcess FIeld BUS

@item PROFS
PRofessional OFfice System (IBM, VM)

@item PROLOG
PROgramming in LOGic

@item PROM
Partial Read Only Memory, "P-ROM" 

@item PROM
Programmable Read Only Memory

@item PROMATS
PROgrammable Magnetic Tape System

@item PROPAL
PROgrammed PAL

@item PROS
??? [protocol]

@item PROTEL
PRocedure Oriented Type Enforcing Language

@item PRPQ
Programming Request for Price Quotation

@item PRS
Pattern-Recognition System (PR)

@item PRT
Portable Remote Terminal

@item PRT
Program Reference Table

@item PRTM
Printing Response Time Monitor

@item PS
PostScript (Adobe)

@item PS
Power Supply

@item PS
Privilege Service (DCE)

@item PS
Process Status (Unix)

@item PS2
Personal System /2, "PS/2" 

@item PSAP
Presentation Service Access Point (OSI, OSI/RM, SAP)

@item PSB
Program Specification Block

@item PSC
Pittsburgh Supercomputing Center (org., USA)

@item PSCNET
Pittsburgh Supercomputing Center NETwork (network, USA), "PSCnet"

@item PSD
Printer Sharing Device

@item PSD
Programmer's Supplementary Documents (BSD, Unix)

@item PSDC
Public Switched Digital Capability

@item PSDN
Packet-Switching Data Network

@item PSDS
Public-Switched Digital Service

@item PSE
Packet Switch Exchange

@item PSE
Port Switched Ethernet (Bytex, VLAN, ethernet)

@item PSES
P-bit Severely Errored Seconds (DS3/E3)

@item PSF
Permanent Swap File

@item PSF
Print Services Facility (IBM)

@item PSI
Performance Systems International, inc.

@item PSID
Presentation Space IDentifier (IBM)

@item PSIPU
PostScript - Intelligent Processing Unit (Canon, Adobe, CLC), "PS-IPU"

@item PSIU
Packet Switch Interface Unit

@item PSK
Phase Shift Keying (DFUE)

@item PSL
PD Service Lage (Haendler)

@item PSL
Public Software Library

@item PSM
Persistent Stored Modules (SQL)

@item PSM
Personal Software Marketing (IBM)

@item PSN
Packet / Public Switched Network

@item PSN
Packet Switch Node (ARPANET, MILNET)

@item PSOM
Persistency framework in SOMobjects (IBM, DSOM)

@item PSP
Personal Software Products (IBM)

@item PSP
Program Segment Prefix (DOS)

@item PSP
ProjektStrukturPlan

@item PSPDN
Packet Switched Public Data Network (IN)

@item PSR
Phase Shift Register

@item PSR
Program Support Representative

@item PSRG
Privacy and Security Research Group (IRTF)

@item PSRO
Professional Standards Review Organization

@item PSS
Packet Switch Services / Stream

@item PST
Pacific Standard Time [-0800] (TZ, PDT, USA)

@item PSTN
Public Switched Telephone Network (IN)

@item PSU
Portable Storage Unit

@item PSU
Primary Sampling Unit

@item PSU
Program Storage Unit

@item PSW
Program Status Word

@item PT
Payload Type (ATM)

@item PTAL
Payment Transaction Application Layer (Internet, banking)

@item PTAT
Private Trans-Atlantic Telecommunications

@item PTB
Physikalisch-Technische Bundesanstalt (org.)

@item PTC
Pacific Telecommunications Council (org.)

@item PTC
Parallel Test Component (ISO 9646-3, TTCN)

@item PTD
Parallel Transfer Disk / Drive

@item PTE
Packet Transport Equipment

@item PTE
Path Terminating Equipment (SONET)

@item PTF
Program Temporary Fix (IBM)

@item PTI
Payload Type Identifier (ATM, PT)

@item PTM
Packet Transfer Mode (ATM)

@item PTO
Patent and Trademark Office (org., USA)

@item PTOCA
Presentation Text Object Content Architecture (IBM, MO:DCA)

@item PTP
Paper Tape Punch

@item PTR
Paper Tape Reader

@item PTT
Postes, Telegraphe et Telephone (org., Switzerland)

@item PTW
Primary Translation Word

@item PTY
Pseudo-Terminal driver

@item PU
Physical Unit (NAU)

@item PU
Power Unit

@item PU
Processing Unit

@item PUA
Profiling User Agent

@item PUB
Physical Unit Block

@item PUC
Peripheral Unit Controller

@item PUC
Public Utilities Commission

@item PUCP
Physical Unit Control Point (IBM, SNA)

@item PUFFT
Purdue University Fast FORTRAN compiler (FORTRAN)

@item PUID
Physical Unit IDentifier (IBM)

@item PUMA
Power User's Macintosh Association (org., Apple)

@item PUMA
Processor Upgradable Modular Architecture

@item PUMA
Programmable Universal Micro Accelerator

@item PUMS
Physical Unit Management Services

@item PUP
PARC Universal packet Protocol

@item PUT
Program Update Tape

@item PV
Physical Volume (LVM, HDD)

@item PVC
Permanent Virtual Circuit (SVC)

@item PVC
Permanent Virtual Circuit / Channel / Connection (ATM)

@item PVCC
Permanent Virtual Channel Connection (ATM)

@item PVCS
Polytron Version Control System

@item PVD
Primary Volume Descriptor (CD, IS 9660)

@item PVITL
Program-Variation-In-The-Large (SCM)

@item PVITS
Program-Variation-In-The-Small (SCM)

@item PVM
Parallel Virtual Machine

@item PVN
Private Virtual Network

@item PVP
Packet Video Protocol

@item PVPC
Permanent Virtual Path Connection (ATM)

@item PWB
Printer Wire Board

@item PWB
Programmers Work Bench (MS)

@item PWD
Print Working Directory (Unix)

@item PWM
Pulse Width Modulation (DVD)

@item PWN
Peacenet World News

@item PWSCS
Programmable WorkStation Communication Services

@item PWV
Pulse-Wave Velocity

@item PY
Person Years

@item PZDF
Phil Zimmermann Defense Fund (PGP)

@item PZE
???

@end table