P

p

pico (10^-12)

P&S

Pan & Scan

P2P

Path to Profitability

P3P

Platform for Privacy Preferences

PAL

Phase Alternating Line

PARC

Palo Alto Research Center, USA (Xerox)

PARIS

Professional Audio Recording Integrated System

Pb

Petabyte (1024 Tb, 2⁵⁰ b)

PB

Playboy [Magazine]

Pb

Plumbum [lead]

PBCAK

;-) Problem Between Chair And Keyboard

PC

Personal Computer (term invented by IBM - sometimes used to denote an IBM PC XT-compatible computer, sometimes used to denote any kind of single-user computer)

PC

Politically Correct (note that the term "PC" would not be "PC" in a Macintosh context, thus creating a contradiction) ;-) (from CHL)

PCI

Peripheral Component Interconnect

PCM

Pulse Code Modulation

PCMCIA

PC Memory Card International Association (as in PCMCIA-Cards - now known as PC-Cards)

PD

Police Department

PD

Public Domain

PDA

Personal Digital Assistant

PDF

Portable Document Format (Adobe Acrobat)

PDM

Product Data Management

PDP

Program Data Processor (DEC)

PDPMEMA

Please Don't Publish My E-Mail Address

PDQ

Pretty Damn Quick

PDT

Pacific (USA) DST (GMT-7)

PERL

Practical Extraction and Report Language

PGA

Pin Grid Array

PGP

Pretty Good Privacy (data encryption algorithm)

PHB

Pointy-Haired Boss (data encryption algorithm) (Dilbert)

PIM

Personal Information Manager

PIN

Personal Identification Number

PKI

Public Key Infrastructure

PL/B

Programming Language for Business [purposes]

PM

Post Meridiem [past noon]

PNG

Portable Network Graphics

PNP

Plug aNd Play

PO

Post Office

POP

Point Of Presence

POP

PO Protocol (often followed by a version number)

POST

Power On Self Test

POTS

Plain Old Telephone Service

PPC

Power PC - Power Performance Chip (IBM/Motorola/Apple)

PPCP

PPC Platform

PPP

Point to Point Protocol

PPTP

Point to Point Tunneling Protocol

PPV

Pay Per View

PR

Public Relations

PRAM

Parameter RAM

PReP

Power PC Reference Platform (now PPCP)

PROM

Programmable ROM

PS

Personal System (as in IBM PS/2 line of computers)

PS

PostScript (Adobe)

PS

Post Scriptum

PST

Pacific (USA) Standard Time (GMT-8)

PSX

PlayStation X (early code name for the Sony PlayStation - the X was dropped, but the acronym stuck)

PTO

Please Turn Over

PTY

Program TYpe