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Old 14th February 2007
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Let's build on this list -- Is anything missing from this list?
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p-p peak-to-peak
P/I packaging and interconnecting
P4 photolithographic pattern plated probe
Pa Pascal
pA picoampere
PA-RISC Precision Architecture - Reduced Instruction Set
PA/R peak-to-average ratio
PABX private access/area branch exchange
PAC pad array carrier
PAC Perceptual Audio Coder
PAD packet assembler/disassembler
PAD programmable address decoder
PAD bus processor address data bus
PAL phase-alternation line; French TV spec
PAL programmable-array logic
PALC plasma-addressed liquid crystal (display)
PAM pulse-amplitude modulation
PARD periodic and random deviation
PASC Perceptual Audio Sub-band Coding
PBA printed board assembly
PBGA plastic ball-grid array
PBGAM plastic ball-grid array, multilayer
PBT chemical designation like PBC, etc
PBX private branch exchange
PC personal computer
pC picocoulomb
pc board (PCB) printed-circuit board
PC-QFP printed-circuit-based quad flat pack
PCC Personal Communication Computer (European)
PCF point coordination function
PDH Personal Digital Communications
PCI Peripheral Component Interconnect [bus]
PCI SIG PCI Special Interest Group
PCIA Personal Communications Industry Association
PCL printer control language
PCM pulse-code modulation
PCMCIA Personal Computer Memory Card International Association
PCN personal communications network
PCOM private communications
PCR plastic chip carrier
PCS plastic clad silica
PCS personal communications service/system
PCU peripheral control unit
PD pulsed doppler (radar)
PDA personal digital assistant (portable computing)
PdAg palladium silver
PDC personal digital cellular (telecommunications system)
PDEF physical design exchange format
PDH plesiochronous-digital hierarchy (communications network)
PDI perspective dark-field imaging (semiconductor wafer inspection)
PDIAL public-access dial-up (Internet provider)
PDIF P-CAD data interchange format
PDIP plastic dual-inline package
PDM product data management
PDP plasma display panel
PDT prototype debug tool (Tektronix)
PDU protocol data unit
PEBB power electronics building block
PECC partially error-controlled connections
PECL positive/pseudo emitter-coupled logic
PECVD plasma-enhanced chemical vapor deposition
PEEL Programmable Electrically Erasable Logic
PEM privacy enhanced mail (Internet)
PEP Programmable Electronics Performance (Corp standard)
pF picofarad
PF power factor
PFC power-factor correction (power supply)
PFM pulse frequency modulation (battery charging)
PGA pin-grid array
PGA programmable gain amplifier
PGD 'pretty good die' (IC production)
PGP 'pretty good privacy' (Internet encryption algorithm)
PHEMT pseudomorphic high electronic mobility technology (FET process)
PHP Personal Handyphone (Japanese standard)
PHP power hybrid package
PHY physical layer
PIC parallel intereference cancellation
PICMG PCI Industrial Computer Manufacturers Group
PID proportional-integral differential control loops
PIN positive-doped/intrinsic/negative-doped
PIN pn junction with isolation region
PIND particle impact noise detection
PIO parallel I/O
PIP procedural interface protocol
PIV peak inverse voltage
pixel picture element
pJ picojoule
PKI public-key infrastructure
PLA programmable-logic array; Signetics trademark
PLACE PEEL Architectural Compiler/Editor
PLC planar light-wave circuit
PLCC plastic leaded chip carrier
PLCP physical-layer convergence procedure
PLD programmable-logic device
PLDC polymer-dispersed liquid crystal (display)
PLI Programming Language Interface (OVI)
PLL phase-locked loop
PLS programmable logic sequencer
PM phase modulation
PMA post-metallization anneal
PMC PCI Mezzanine Card (standard)
PMCM plastic multichip module
PMD physical media dependent
PMOS p-type metal-oxide semiconductor
PMP post-metal programming
PMT photo-multiplier tube
PMU parametric measurement unit
PN processor node
PNN probabilistic neural network
pnp p-type n-type p-type
PnP Plug and Play (ISA standard)
POP point of presence (Internet)
POP Post Office Protocol (Internet)
PoS packet-over-SONET
POSIX portable operating system interface - Unix
POST power-on self tests
POT plain-old telephony
POTS plain-old telephone service (system?)
POV point of view
PPGA plastic pin grid array
PPI plan position indicator (radar)
ppm part(s) per million
PPP Point-to-Point Protocol (Internet)
pps pulses per second
PPT precision pad technology
PQFP plastic quad flat pack (IC)
PRACH physical random access channel
PRBA Portable Rechargeable Battery Association
PRBS pseudorandom bit stream
PREP PowerPC reference platform
PRF pulse repetition frequency (radar)
PRML partial-response maximum-likelihood (disk storage)
PRN pseudo-random noise
PRO Precision RISC Organization
PROM programmable ROM
PRS pattern recognition system
PSD power spectral density
psec picosecond
PSG phospho-silicate glass
psi pound(s) per square inch
psia pound(s) per square inch absolute
psig pound(s) per square inch gauge
PSK phase-shift keying
PSOP power small outline package
PSP programmable signal processor
PSPDN packet switched public data network
PSRAM pseudo-static RAM
PSRR power-supply rejection ratio
PSTN Public Switched Telephone Network
PtAu platinum gold
PTC positive temperature coefficient
PTE path terminating equipment
PTF polymer-thick-film
PTO Patent and Trademark Office (US Government)
pV picovolt
PVC polyvinyl-chloride
PVD peak voltage detect/physical vapor deposition
pW picowatt
PWM pulse-width modulation
PXI PCI eXtensions for Instrumentation
PZM pressure zone microphone

Q quality factor (of a resonant circuit)
QAM quadrature amplitude modulation
QAS Quick Arbitrate and Select
QC quality control
QCIF quarter-common intermediate format
QDR quad data rate
QE quantum efficiency (photomultiplier)
QFB quad flat butt-leaded package
QFP quad flat pack
QIC quarter-inch cartridge (storage)
QKT quick key telephone coupler
QM queue management
QML qualified manufacturers list
QoS quality of service (communications)
QPL qualified part/product list (procurement)
QPL Qualified Products List
QPM quasi-phase-matched
QPSK quadrature phase-shift keying (communications)
QSM queued serial module
QSOP quarter-size outline package
QTAG Quality Test Action Group (communications)
QTCP quad tape carrier package
QUIP quad in-line package
QVGA quarter VGA (320X240 pixels)

RACH random access channel
rad radian
RADSL rate adaptive digital subscriber line
RAID redundant array of inexpensive disks
RAM random access memory
RAMDAC random access memory, digital-to-analog converter (combination)
RAS row address strobe
RAS remote access service (network)
RASSP Rapid Prototyping of Application Specific Signal Processors (ARPA project)
RAVE real-time audio/visual environment
RBOC regional Bell operating company
RC resistance-capacitance
RC-4 Rivest's Cipher
RCA Recording Corporation of America -- a/v connectors also known as phono plugs and jacks.
RCC rectangular chip carrier
RCM release complete message
RDBMS Relational Data Base Management System
READ relative element address designate
RED random early discard
REL release message
RF radio frequency
RFC request for comment (communications)
RFC radio frequency choke
RFI radio-frequency interference
RFIC radio-frequency integrated circuit
RFID radio frequency identification
RFP request for proposal
RGB red, green, blue
RHET resonant-tunneling hot-electron transistor
RHP reconfigurable hardware products
RIE reactive ion etching
RIO random early discard In/Out of Profile
RIP raster image processor (DTP)
RISC reduced-instruction-set computer
RISR remote interrupt service routine
RIU ring interface unit
RLC resistance-inductance-capacitance
RLE run-length encoding (data compression)
RLL run length limited (eg: 2,7 RLL)
RLN remote LAN node
RLQ rate-limiting queues
RM resource management
RMI resource-manager interface
RMII Reduced Media Independent Interface
RMON Remote Network Monitoring
rms root-mean-square
RMW read-modify-write (software)
RO reverse osmosis
RoHS The Restriction of Hazardous Substances in Electrical and Electronic Equipment Directive
ROM read-only memory
ROTS rugged off-the-shelf
ROW rest of the world
RP rapid prototyping
RP reinforced plastic
RPC remote procedural call (network)
RPC remote-procedure calls
rpm revolutions per minute
rps revolutions per second
RR round-robin
RS recommended standard
RSA Rivest, Shamir and Adelman (encryption)
RSSI received signal strength indicator
rt-VBR real-time variable bit rate
RTD resistance temperature detector
RTEID Real-Time Executive Interface Definition (Motorola)
RTI return from interrupt
RTL resistor transfer logic
RTL register-transfer level/language
RTM resin transfer molding
RTO return to output
RTOS real-time operating system
RTP rapid thermal processing
RTPS real-time publish-subscribe
RTS request-to-send
RTV room-temperature-vulcanized (silicone)
RTV real-time video
RW read/write

S-DAB satellite digital audio broadcasting
S/DMS SONET/digital multiplex switch
S/H sample and hold
SACD super-audio compact disc
SAM serial access memory
SAM switched access with multiplexer
sample/sec samples per second
SAN storage-area network
SAPI service access point identifier
SAR synthetic aperture radar
SAR segmentation and reassembly (communications)
SAS silicon asymmetrical switch
SASI Shugart Associates System Interface
SAW surface acoustic wave
SBC single-board computer
SBDIP side-brazed dual in-line package
SBIC shared bus interface controller
SBIR Small Business Innovation Research
SBM shared buffer memory (Alcatel)
SBS silicon bilateral switch
SBS smart battery system
SC shared cored (Ericsson)
SC/H subcarrier-to-horizontal (phase shift) phase of color burst extended to the leading edge of the horizontal sync pulse
SCAM SCSI configured automatically (ANSI protocol)
SCC serial communications controller
SCC square chip carrier
SCC stackable ceramic carrier
SCCM standard cubic centimeters/per minute
SCE storage-control element
SCFL source-coupled FET logic
SCH synchronization channel
SCI scalable coherent interface
SCI-PHY Saturn-Compliant Interface - Physical (device protocol)
SCIM single-chip integration module
SCM single-chip module
SCOT sealed chips on tape
SCPI Standards Committee for Programmable instruments
SCR silicon-controlled rectifier
SCS silicon-controlled switch
SCSI Small Computer System Interface
SCTE Society of Cable TV Engineers
SCXI signal conditioning extension for instrumentation
SDBGA super dissipation ball grid array
SDC small diaphragm condenser
SDCM serial data converter modules
SDF standard-delay format
SDF Standard Delay File (OVI)
SDH synchronous digital hierarchy
SDIO secure-digital input/output
SDIP shrink dual-in-line package
SDK system development kit
SDLC software description language C
SDLC synchronous data-link control
SDLVA successive-detection log video amplifier (microwave)
SDOF single degree-of-freedom
SDRAM synchronous DRAM
SDSC Standards and Data Services Committee
SDTV standard-definition digital television
SE Switch Element
SEAL simple and efficient AAL
sec secant
sec second
SECAM Systeme Electronique Couleur Avec Memoire (European video standard)
SECAM Sequential Couleur Avec Memoire
SECS Semiconductor Equipment and Material International's Equipment Communications Standard
SEG special effects generator
SEI secondary electron imaging (surface inspection)
SEL surface-emitting lasers
SELV safety extra-low voltage
SEM-E standard electronic module e-type (avionics)
SEMI Semiconductor Equipment and Material International (Association, Mountain View, CA)
SEP signaling endpoint
SERDES serializer/deserializer
SEU single-event upset
SFBI shared frame-buffer interface
SFC Shannon-Farro coding (data compression)
SFDR spurious free dynamic range
SFFPCI Small Form-Factor Personal Computer Interface(standard)
SFP short-fault protection
SFROM smart flash ROM
SGA solder grid array
SGMP simple gateway monitoring protocol
SHA sample-and-hold amplifier (ADC)
SHF super high frequency
SHG second harmonic generation
SHT suppressed high-level differential transfer (circuit)
Si silicon
SIA Semiconductor Industry Association (Washington DC
SIC Standard Industrial Classification (numbering code)
SiC silicon carbide
SICL standard instrument control library
SID Society for Information Display (PCI)
SIG Special Interest Group
SiGe silicon germanium
SIM single inline module
SIM Subscriber Identity Module
SIMD single-instruction, multiple-data (array)
SIMM single in-line memory module
SiN silicon nitride
sin sine
SINAD signal-to-noise-and-distortion (ratio)
SIO serial I/O
SiO silicon oxide
SIP Session Initialization Protocol
SIP single in-line package
SIP SMDS interface protocol
SIR signal-to-interference ratio
SIR surface insulation resistance
SIU system interface unit
SIU system integration unit
SL stripline
SLA sealed lead acid
SLAM scanning laser acoustic microscope
SLC single-layer ceramic
SLC surface laminar circuit
SLD source level debugger
SLIC subscriber-line interface circuit (communications)
Slicc slightly larger than IC carrier (packaging)
SLIP Serial-Line Internet Protocol
SLT solid logic technology
SMA Semiconductor Manufacturers Association (UK)
SMA surface-mounted assembly
SMART stress-marginality and accelerated-reliability testing
SMART Standard Module Avionics Repair and Test(software)
SMB shared-memory buffer
SMBus system-management bus
SMC S-Bus mezzanine card
SMC surface-mount components
SMD solder mask defined
SMD Storage Module Drive
SMD surface-mount device
SMDS switched multimegabit data services (Europe)
SME small-to-medium enterprises
SMEMA Surface Mount Equipment Manufacturers Association
SMF single-mode fiber
SMI small- and medium-sized industries
SMI (power) system management interrupts
SMII Serial Media Independent Interface
SMM (power) system management mode
SMOBC solder mask over bare copper
SMP symmetric multiprocessing
SMPGA surface-mount pin grid array
SMPS switch-mode power supply
SMPTE Society of Motion Picture and TV Engineers
SMRT surface-mount and reflow technology
SMT surface-mount technology
SMTA Surface-Mount Technology Association
SMU source-measure unit
SMUG Spokane Microcomputer Users Group
SMX-6000 a Fujitsu switch model
SNA systems network architecture (IBM)
SNet SONET Network (Northern Telecom)
SNMP simple network management protocol
SNR signal-to-noise ratio
SO small outline
SOB small outline butt-leaded package
SOC system on chip
SOG spin-on glass
SOHO small office, home office
SOI silicon-on-insulator (IC)
SOIC small-outline IC
SOJ SOIC with J-leads
SOLA short, open, load and air-capacitor
SONET synchronous optical network
SOP small-outline package
SOPC system on a programmable chip
SORF small-outline radio frequency (package)
SOS silicon on sapphire
SOSCARD Secure Operating System Card
SOT small-outline transistor
SOVA soft-output Viterbi algorithms
SP span processor
SP switch port (Ericsson)
SPARC scalable processor architecture
Sparc scalable processor architecture
SPDIP shrink plastic dual in-line package
SPDM scalable polynomial-delay model
spdt single-pole, double-throw
SPE synchronous payload envelope
SPI serial peripheral interface
SPI synchronous pixel interface
Spice Simulation Program with Integrated Circuit
SPIE The International Society for Optical Engineering
SPL sound pressure level
SPLD simple programmable-logic device
SPM scanning probe microscope
SPS samples per second
SPS sound-processing software
spst single-pole, single-throw
SQAM Sound Quality Assessment Material
SQC statistical quality control
SQE signal-quality error
SQFP shrink quad flat pack
SQL search and query language
SQPSK staggered quadrature phase-shift keying (communications)
SR set/reset (flip-flop)
SRAM static random-access memory
SRC Semiconductor Research Corporation (industry funded)
SRCS SilkRoad Refractive Synchronization Communication
SRL shift register latch
SS spread spectrum (communications)
SS7 Signalling System 7
SSA serial storage architecture
SSB single sideband
SSD solid-state disk
SSET switching system exchange termination
SSH simultaneous sample and hold (data acquisition)
SSI small-scale integration
SSL Secure Sockets Layer
SSMM solid-state mass memory
SSOP shrink small-outline package
SSR scalable sampling rate
SSR solid-state relay
SST Science, Space, and Technology (US House of Representatives committee)
SST solid state technology
SST simultaneous self-test (logic mode)
SST supersonic transport (aircraft)
SSTL stub-series-terminated logic
STB set-top box
STL Schottky transistor logic
STM scanning tunneling microscope
STM synchronous transfer mode
STM synchronous transport module
STN The Scientific and Technical Information Network (Internet)
STP shielded twisted pair
STRIFE stress and life (testing)
STS synchronous transport signal
STT set-top terminal
STTL Schottky transistor-transistor logic (TTL)
SUI speech user interface (multimedia)
SUS silicon unilateral switch
SVD simultaneous voice and data
SVGA super video graphics adapter (800X600 pixels)
SVHS super VHS (video format)
SVP surge voltage protector
SWL sound (power) level
SWR standing-wave ratio
SYSOP system operator (Internet)