An acronym is an abbreviation of the first letters of a phrase or the long name of an organization that forms a word or conveys a message. In electronic communication or online documents, acronyms are used as writing shorthand or a method to communicate humor. Below, you will find an alphabetical listing for hundreds of computer related acronyms. 

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[P]

PAC - Platform Adapter Component
PAD - Packet Assembler/Dissembler
PADS - Personal Automated Design System
PAE - Physical Address Extensions
PAL - Phase Alternation Line
PAP - Password Authentication Protocol
PA-RISC - Precision Architecture Reduced Instruction Set Computer
PAT - PArtition Table
PBCache - Pipeline Burst Cache
PC - Personal Computer
PC - Program Counter
PCA - Printed Circuit Assembly
PCA - Program Calibration Array
P-CAV - Partial Constant Angular Velocity
PCB - Printed-Circuit Board
PCI - Peripheral Component Interconnect
PCI SIG - Peripheral Component Interconnect Special Interest Group
PCL - Postscript Communication Language
PCM - PC Magazine
PCM - Pulse Code Modulation
PCMCIA - Personal Computer Memory Card Association
PCMCIA - People Can't Memorize Computer Industry Acronyms
PCR - PCI Configuration Registers
PCS - Personal Card System
PCS - Portable Computer System
PDA - Percent Defective Allowable
PDA - Personal Digital Assistant
PDAP - Prospero Data Access Protocol
PDC - Programme Delivery Control
PDF - Portable Document Format
PDL - Page Description Language
PDN - Public Data Network
PDP - Parallel Data Processing
PDU - Protocol Description Unit
PEEL - Programmable Electrically Erasable Logic
PEM - Privacy Enhanced Mail
PERL - Practical Extraction and Report Language
PGA - Pin Grid Array
PGA - Professional Graphics Adapter
PGM - Portable GrayMap
PGML - Precision Graphics Markup Language
PGP - Pretty Good Privacy
PHP - Hypertext Preprocessor
PIC - Paegas Internet Call
PIC - Power Integrated Circuit
PIC - Programmable Interrupt Controller
PID - Process IDentification
PILOT - Programmed Instruction Learning Or Testing
PIM - Personal Information Manager
PIN - Personal Identification Number
PINE - Program for Internet News and Email
PINE - PINE Is Not Elm ]-)
PING - Packet InterNet Groper
PIO - Parallel Input/Output
PIO - Programmed Input/Output
PIP - Picture In Picture
PIP - Power Interface Products
PISA - PCI+ISA
PIXEL - PIcture ELement
PKI - Public Key Infrastructure
PLCC - Plastic Leaded Chip Carrier
PLEDM - Phase-state Low Electron Drive Memory
PLIP - Parallel Line Internet Protocol
PLL - Phase Locked Loop
PM - Phase Modulation
PMA - Photo Marketing Association
PMA - Program Memory Array
PME - Power Management Event
PMM - POST Memory Manager
PMM - Power Management Mode
PMMU - Paged Memory Management Unit
PMP - Portable Media Player
PMPO - Power Maximum Peak Output
PMT - PhotoMultiplier Tube
PNI - Prescott New Instructions
PnP - Plug and Play
POCSAG - Post Office Code Standardization Group
POF - Plastic Optic Fiber
POI - Point Of Interconnection
POP - Post Office Protocol
POS - Point Of Sale
POSIX - Portable Operating System Interface
POST - Power On Self Test
POV-Ray - Persistence Of Vision Raytracer
PPC - Plasma Particle Cannon
PPC - Power PC
PPGA - Plastic Pin Grid Array
PPM - Page Per Minute
PPM - Portable PixMap
PPP - Point-to-Point Protocol
PPTP - Point-to-Point Tunneling Protocol
PQ - PowerQuest
PRA - Primary Rate Access
PRAM - Parameter Random Access Memory
PRM - Packet Radio Measurement
PRML - Partial Response Maximum Likehood
PROLOG - PROgramming LOGic
PROM - Programmable Read Only Memory
PS - Personal System
PSDN - Packet Switched Data Network
PSK - Phase Shift Keying
PSP - Program Segment Prefix
PTE - Page Table Entries
PTP - Parcel Transfer Protocol
PTP - Peer To Peer
PTSA - Product Term Sharing Array
PTY - Program TYpe
PUK - Personal Unblocking Key
PVC - Permanent Virtual Channel
PVI - Photo Voltaic Isolator
PVP - Packet Video Protocol
PVR - Personal Video Recorder
PWM - Pulse Width Modulation
PXE - Preboot eXecution Environment
PXP - Program modeling eXternal Process