SA Selective Availability
SAA Systems Application Architecture [IBM]
SABRE Semi-Automatic Business Research Environment
SAC Single Attachment¹ Concentrator
SACL System Access Control List
SADL Synchronous² Data Link Control [Racal-Vadic]
SAINT * Symbolic³ Automatic Integrator
SAL Shift Arithmetic Left
SAM Serial⁴ Access Memory + Sequential Access Method +
Security Accounts Manager [Microsoft] +
Single Application Mode [Microsoft]
SAN Storage/System Area Network
SANE Standard Apple Numeric Environment
SAP Second Audio Program + Service Access Point [DEC] +
Service Advertising⁵ Protocol⁶ +
* Symbolic Assembly Program +
Systems, Applications and Products (company)
SAPI Speech Application Program Interface⁷ [Microsoft]
SAR Segmentation and Reassembly +
Shift Arithmetic Right +
Successive Approximation Register +
Synthetic Aperature Radar
SAS Sales Accounting⁸ System + Single Attached Station +
Single Audio System + Statistical⁹ Analysis System
SASI Shugart Associates System Interface (SCSI originated
from SASI)
SATAN Security Administrator¹⁰ Tool for Analyzing¹¹ Networks
.SAV Saved (file name extension)
SAVDM Single Application VDM
SB Sound Blaster [Creative Labs] + Sound Board
SBA Scene Balance Algorithms [Kodak]
SBB Subtract With Borrow
SBC Single-Board Computer
SBCS Single-Byte Character Set
SBI Sound Blaster Instrument
.SBR Source Browser¹² (file name extension) [Borland]
SBS Smart Battery Specification¹³ [Duracell/Intel]
.SC script (file name extension)
SCADA Supervisory Control and Data Acquisition
SCAM SCSI Configuration¹⁴ Automatically
SCAS Scan String
SCB Subsystem Control Block [IBM]
SCC Serial Communications Controllers +
Serial Controller Chip +
Synchronous Channel Check [IBM]
SCCS Source Code Control System
SCD Standard Color Display
S-CDMA Synchronous Code-Division Multiple Access
SCF System Control Facility
SCI Scalable Coherent Interface +
Serial Communications Interface
SCI. Science [USENET Newsgroup Category]
SCIL Serial Control Interface Logic¹⁵
SCLM Software Configuration and Library Management [IBM]
SCM ScreenCam Format¹⁶ [Lotus] +
Software Configuration Management + Station Class Mark
SCO Santa Cruz Operation (Software Company)
SCOPE Simple Communications Programming Environment
[Hayes]
SCP Save Cursor Position + Subsystem Control Port +
System Control Program
SCR Silicon¹⁷ Controlled Rectifier
.SCR script (file name extension)
SCRN Screen (video display)
SCRS Scalable Cluster of RISC Systems
SCSA Signal Computing¹⁸ System Architecture [Dialogic]
SCSI Small Computer Systems Interface
SD Send Data + Super Density¹⁹
SDA Software Disk Array + Source Data Automation +
System Display Architecture [Digital]
SDAM Single DOS Application Mode
SDB Symbolic Debugger [Unix]
SDD Software Description Database [Internet] +
Subscriber²⁰ Data document +
System Distribution Directory
SDF Space Delimited File + Space Delimited Format
.SDF Standard Data Format (file name extension)
SDH Synchronous Digital Hierarchy
SDI Selective Dissemination²¹ of Information +
Single document Interface
Software Development Interface [Mosaic]
SDK Software Development Kit²² [Microsoft]
SDL Specification and Description Language
SDLC Synchronous Data Link Control (protocol)
SDM System Development Multitasking
SDMS SCSI Device Management System [NCR]
SDN Software Defined Network [AT&T]
SDNS Secure Data Network Service
SDR Streaming Data Request
SDRAM Synchronous DRAM
SD-ROM Super Density ROM
SDS Sysops Distribution System
SDSL Single-Line/Symmetric Digital Subscriber Line
SD_STB Streaming Data Strobe [IBM]
SDTV Standard Definition Television
SDV Switched Digital Video [AT&T]
SDX Storage Data Acceleration
SEA Standard Extended Attribute [OS/2]
.SEA Self Extracting Archive (file name extension) [Macintosh]
SEAC * Name of first computer to use transistors²³, built by
(National Bureau of) Standards Eastern Automatic
Calculator (Also see SWAC)
SEAL Segmentation and Reassembly Layer (protocol) +
Screening External Access Link [Digital-DEC]
SEC Single Error Correction
SECAM Sequentiel Couleur Avec Memoire
(Sequential Color With Memory)
SECC Single Edge Contact Cartridge
SED Stream Editor + Stream-Oriented Editor
SEG Segment
SEH Structured Exception Handling
SEL Select
SEM Scanning Electron Microscope +
Standard Electronic Module²⁴ +
Strategic Enterprise Management [SAP]
SEPP Secure Encryption Payment Protocol
SER Serial
SERCOS Serial Real-Time Communications System
SET Secure Electronic Transaction +
Softwave Engineering Technology
.SET Driver Set (file name extension) [Lotus 1-2-3] [LDC] +
Image Settings (file name extension) [Paradox]
SETEXT Structure Enhanced Text [Internet]
SEU Smallest Executable Unit
SF Sign Flag
SFC System File Checker
SFD Start Frame Delimiter
SFDR Spurious-Free Dynamic Range
SFN Short File Name
SFQL Structured Full-text Query²⁶ Language
SFS System File Server
SFT System Fault Tolerance
SFX Sound Effect(s)
SGA Shared Global Area
SGEN Signal Generator²⁷ + System Generator
SGDT Store Global Descriptor Table
SGI Silicon Graphics²⁸, Inc.
SGM Shaded Graphics Modeling
SGML Standard Generalized Markup²⁹ Language
SGR Set Graphics Rendition
SGRAM Synchronous Graphics RAM
S/H Sample and Hold
SHA Secure Hash Algorithm [NSA]
SHAR Shell Archive
SHED Segmented Hypergraphic Editor
SHG Segmented Hypergraphics
SHL Shift Logical Left
SHR Shift Logical Right
SHTML Server-Side Include HyperText Markup Language
S-HTTP Secure Hypertext Transfer Protocol
SHV Standard High-Volume
.SHW Show (file name extension)
SI Shift-In + Source Index + System Information +
System Integration³⁰
SIC Standard Industrial Code
SID Security Identifier + Serial Input³¹ Data +
Station Identification [AT&T] +
Symbolic Interactive³² Debugger + System ID
SIDF System Independent Data Format
SIDH System Identification for Home Systems
SIDT Store Interrupt Descriptor Table
SIFT Stanford Information Filtering Tool
SIG Special Interest Group
SIGCAT Special Interest Group on CD-ROM Applications
and Technology
SIM Simulator
SIMD Single Instruction, Multiple Data-stream (processor)
SIMM Single In-line Memory Module
SIMTEL Simulation and Teleprocessing
SIMULA Simulation (language)
SIO Serial Input/Output (communications driver)
SIP Session Initiation³³ Protocol + Single In-line Package
SIPC Simply Interactive Personal Computer [Microsoft]
SIPO Serial In, Parallel Out
SIPP Single In-line Pin Package
SIR Serial Infrared³⁴ [Hewlett-Packard]
SIRDS Single-Image Random³⁵ Dot Stereogram
SI/SO Serial In/Serial Out + Shift In/Shift Out
SIT Special Information Tones
.SIT Stuff-It (compressed file name extension) [Macintosh]
SIU System Interface Unit
SKIP Simple Key-Management for Internet Protocols²⁵ [Sun]
SKU# Stock Keeping Unit Number
SLA Service Level Agreement
SLC Subscriber Line Concentrator
SLDT Store Local Descriptor Table
SLED Single Large Expensive Disk
SLIC System Level Integration Circuit +
  System Licensed³⁶ Internal Code [IBM]
SLIM Structured Language for Internet Markup
SLIP Serial Line Interface Protocol
SLM Spatial³⁷ Light Modulator
SLMR Silly Little Mail Reader
SLOSH Sea, Lake and Overland Surge from Hurricane (program)
SLP Service Location Protocol
SLSI Super Large-Scale Integration
SLSS Systems Library Subscription³⁸ Service [IBM]
SLU Spoken Language Understanding
SM Set Mode + Shared Memory
SMART Self-Monitoring Analysis and Reporting Technology
SMB Server Message Block (protocol) [MII]
SMD Surface Mounted Device
SMDR Station Message Detail Recording
SMDS Switched Multimedia³⁹/Multi-Megabit Data Service
SMF Single Mode Fiber⁴⁰ + System Manager Facility [Compaq]
SMI System Management Interrupt [Intel]
SMIF Standard Mechanical Interface
SMIL Synchronized⁴¹ Multimedia Integration Language
S-MIME Secure MIME
SMIT System Management Interface Tool [IBM]
SMK Software Migration⁴² Kit [Microsoft]
SML Standard Meta Language
SMM System Management Mode [Intel]
SMOBC Solder⁴³ Mask Over Bare Copper
SMP Simple Management Protocol + Symbolic Manipulation
Program + Symmetrical Multi-Processing +
Symmetric Multiprocessor
.SMP Sample (file name extension)
SMPC Shared Memory Parallel Computer
SMPS Switching Mode Power Supply
SMRAM System Management Random Access Memory
SMS Small Messaging System +
Storage Management Services [NetWare] +
Storage Management Subsystem/System +
Systems Management Server [Microsoft]
SMSW Store Machine Status Word
SMT Station Management (protocol) +
Surface-Mount Technology
SMTP Simple Mail Transfer Protocol
SMU System Management Utility
SN Serial Number
S/N Signal-to-Noise (Ratio)
SNA Systems Network Architecture [IBM]
SNAP Sub-Network Access Protocol +
Sub-Network Attachment Point
SND Sound
SNEWS Secure News Server [Internet]
SNMP Simple Network Management Protocol
SNOBOL String Oriented Symbolic Language (Programming Language)
SNP Serial Number/Password [Omen Technology]
SNR Signal-to-Noise Ratio
SOA Start Of Authority
SOC System On a Chip
SOC. Social Issues [USENET Newsgroup Category]
SOCKS Socket⁴⁴ Secure (server) [Internet]
SO-DIMM Small Outline DIMM
SOE Standard Operating Environment
SOH Start of Header
SOHO Small Office/Home Office
SOL Simulation Oriented Language
SOM Start of Message + System Object Model [IBM]
SONET Synchronous Optical Network
SOP Small Outline Package + Standard Operating Procedures
SOS Silicon On Sapphire⁴⁵ + Sophisticated Operating System +
Standards and Open Systems
SOTA State Of The Art
SOX Sound Exchange
SP Service Pack [IBM] + Stack Pointer + System Product
SPA Secure Password Authentication⁴⁶ [Microsoft] +
Software Publishers Association
SPAN Space Physics Analysis Network
SPARC Scalable Processor Architecture +
Sun's Palo Alto Research Center
SPC Small Peripheral⁴⁷ Controller + Statistical Process Control
SPCL Spectrum⁴⁸ Cellular⁴⁹ Corporation
SPCS Stored Program Controlled Switch
SPD Serial Presence Detect
SPEC Systems Performance Evaluation⁵⁰ Cooperative
SPF Shortest Path First + System Programming Facility
SPGA Staggered Pin-Grid Array
SPI Security Parameters⁵¹ Index + Service Provider Interface +
SCSI Parallel Interface
SPID Service Profile/Provider Identifier
SPIKE Science Planning Intelligent Knowledge-Based
Environment [STScI]
SPIRES Stanford Public Information Retrieval System
[Stanford University]
SPL Spooler + System Programming Language [HP]
.SPL Spell Checker (file name extension)
SPLD Simple Programmable Logic Device
SPM System Performance Monitor [IBM]
SPOOL Simultaneous Peripheral Operations On Line
SPOT Shared Product Object Tree [IBM]
SPP Sequenced Packet Protocol + Standard Printer Port
SPPS Scalable Power Parallel System [IBM]
SPR Special Purpose Register +
Statistical Pattern Recognition +
Symmetrical Phase Recording
SPREAD * Systems Programming, Research, Engineering
and Development [IBM]
SPS Secure Packet Shield + Shock Protection System +
Standby Power System
SPSS Statistical Package for the Social Sciences
SPT Sectors⁵² Per Track
SPX Sequenced Packet Exchange [Novell]
SQ Squeezed (files)
SQE Signal Quality Error (test)
SQL/DS Structured Query Language/Data System [IBM]
SQOS Secure Quality Of Service
SQRT Square Root
SR Shift Register
SRAM Shadow Random Access Memory +
Static Random Access Memory
SRAPI Speech Recognition API
SRB Source-Route Bridge
.SRC Source (file name extension)
SRD Screen Reader System
SRDRAM Self-Refreshed DRAM
SRGB Sustained RGB (values)
SRM Security Reference Monitor
SRO Sharable and Read Only
SRP Suggested Retail⁵³ Price
.SRP script (file name extension)
SRPI Server-Requester Programming Interface
SRQ Service Request
SRR Serially⁵⁴ Reusable Resource
SRS Sound Retrieval System
SS Stack Segment + Single Sided + Seconds
SSA Serial Storage Architecture
SSAP Source Service Access Point
SSCP Systems Service Control Point [IBM]
SSD Solid State Disk
SSEC * Selective Sequence Electronic Calculator [IBM]
SSGA System Support Gate Array
SSH Secure Shell (protocol)
SSI Server Side Includes + Single System Image +
Small Scale Integration
SSL Secure Sockets⁵⁵ Layer
SSPI Security Service Provider Interface [Microsoft]
SSRP Simple Server Redundancy Protocol [Cisco]
SST Spread-Spectrum Technology +
Systems Services and Technology
STA Spanning Tree Algorithm
STAR Self Defining Text Archival
STB Strobe
STC Set Carry Flag
STD Set Direction Flag + Standard
STDA StreetTalk Directory Assistance [Banyan]
STDAUX Standard Auxilary
STDERR Standard Error
STDIN Standard Input
STDIO.H Standard Input/Output Header [C Programming Language]
STDM Statistical Time Division Multiplexer
STDOUT Standard Output
STDPRN Standard Printer
STEP Standard for Exchange of Product
.STF Structured File (file name extension) [Lotus Agenda]
STI Set Interrupt Flag
S/TK Sectors Per Track
STL Standard Template Library
STN Super-Twist Nematic
.STORE Businesses Offering Goods (Domain Name) [Internet]
STOS Store String
STP Secure Transfer Protocol + Shielded Twisted Pair (cable) +
Signal Transfer Point +
Synchronized Transaction Processing
STR Store Task Register + Synchronous Transmitter Receiver
STRESS Structural⁵⁶ Engineering System Solver (Programming
Language)
STRUDL Structural Design Language (Programming Language)
STScI Space Telescope Science Institute
STT Secure Transaction Technology [Microsoft]
STX Start of Text
.STY Style (file name extension) [Ventura, Word, WordPerfect]
SUB Subroutine + Substitute + Subtract
SUN Sun Microsystems, Inc.
.SUP Supplemental Dictionary (file name extension)
[WordPerfect]
SVC Switched Virtual Circuit
SVF Simple Vector Format
SVG Scalable Vector Graphics
SVGA Super Video Graphics Array
S-VHS Super VHS
SVM System Virtual Machine [Microsoft]
SVN Switched Virtual Network [IBM]
SVR Server
SVR# System V Release Number [AT&T]
S/W Software
SWAC * Mobile version of SEAC, built for deployment⁵⁷ to White
Sands, and named Standards Western Automatic Calculator
SWAIS Simple Wide Area Information Server [Internet]
SWAP⁵⁸ Shared Wireless⁵⁹ Access Protocol
SWIG Simplified Wrapper and Interface Generator
SWISH Simple Web Indexing System for Humans
SWP Simple Web Printing
.SWP Swap (file name extension)
.SYL Syllabus⁶⁰ (file name extension)
SYLK Symbolic Link
.SYM Symbols (file name extension)
.SYN Synonym⁶¹ (file name extension)
SYNC Synchronous
SYS System
.SYS System Configuration (file name extension) +
System Device Driver (file name extension)
SYSADMIN System Administrator
SYSGEN System Generator
SYSLOG System Log
SYSMOD System Modification
SYSOP System Operator
SYSREQ System Request
SZ Send ZModem [Unix]

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