List of acronyms: S

• S
• * Siemens
• * South
• * Sulphur/Sulfur

S0–9

• S followed by a number is used to denote various German and Austrian S-train lines.
• S4C – Sianel Pedwar Cymru
• S3 - Alternative to SSS

SA

• sa – Sanskrit language
• SA
• * Salvation Army
• * Sand
• * Saudi Arabia
• * Sexaholics Anonymous
• * Sexual assault
• * sine anno
• * Single Adult, a designation in the LDS Church for unmarried individuals 18 and older
• * Situational awareness
• * South Africa
• * South Australia
• * Standards Australia
• * Sturmabteilung
• S.A. – designation for a corporation in many European countries; see article for meanings
• SAA
• * Saudi Arabian Airlines, former name of Saudia
• * Sex Addicts Anonymous
• * South African Airways
• * Southern Athletic Association
• * Standards Association of Australia, a former name of Standards Australia
• SAAB – Svenska Aeroplan AB
• SAAFR – Standard use Army Aircraft Flight Route
• SAAMI – Sporting Arms and Ammunition Manufacturers' Institute
• SAARC – South Asian Association for Regional Cooperation
• SAB – Soprano Alto Baritone
• Sabena – Société anonyme belge d'exploitation de la navigation aérienne
• SABIC – Saudi Basic Industries Corporation
• SABR – Society for American Baseball Research
• SAC
• * Standards Activity Committee
• * U.S. Strategic Air Command
• SACAT – Semi Attended Customer Activated Terminal
• SACEUR – Supreme Allied Commander EURope
• SACF - Semi Automatic Capsule Filler
• SACLANT – Supreme Allied Commander atLANTic
• SACLOS – Semi-Automatic Command to Line of Sight
• SAD
• * Safford Regional Airport
• * Seasonal Affective Disorder
• * Situational Awareness Display
• SADD – originally Students Against Drunk Driving, now Students Against Destructive Decisions
• SADL
• * Situation Awareness Data Link
• * Structural Architecture Description Language
• SADT - Substance Abuse Day Treatment
• SAE
• * Society of Automotive Engineers
• * Stamped addressed envelope
• SAFER – Steel And Foam Energy Reduction
• SAFETY – Stopping Adults Facilitating the Exploitation of Today's Youth
• SAFICT – Software Agents as Facilitators of Interoperability in Collective Training
• sag – Sango language
• SAG
• * Screen Actors Guild
• * Surface Action Group
• SAG-AFTRA – Screen Actors Guild–American Federation of Television and Radio Artists
• SAGAT – Situation Awareness Global Assessment Technique
• SAGE – Semi-Automatic Ground Environment
• SAHB – Sensational Alex Harvey Band
• SAIC – Science Applications International Corporation
• SALT
• * Save A Life Today Alert; Emergency Contact System
• * Southern African Large Telescope
• * Strategic Arms Limitation Talks
• SAM
• * Sequential-Access Memory
• * Sociedad Aeronáutica de Medellín
• * Surface-to-Air Missile
• Sambo – Samooborona b'ez oruzhiya
• SAML – Security Assertion Markup Language
• SANZAAR – South Africa, New Zealand, Australia and Argentina Rugby
• san
• * Sanskrit language
• * Storage Area Network
• SAO -
• SAR
• * Saudi riyal
• * Search And Rescue
• * Special Administrative Region
• * Synthetic Aperture Radar
• SARA
• * Southeastern Association for Research in Astronomy
• * Scientific Atlanta Resident Application
• * Scottish Amateur Rowing Association
• * Southern African Railway Association
• * State Administration for Religious Affairs
• SARP – Search And Rescue Processor
• SARR – Search And Rescue Repeater
• SARS – Severe Acute Respiratory Syndrome
• SART
• * Search and Rescue Transponder
• * Situational Awareness Rating Technique
• SARU – South African Rugby Union
• SAS
• * Scandinavian Airlines System
• * Second Avenue Subway
• * Situational Awareness System
• * Special Air Service
• * Studies, Analysis and Simulation
• * Side Angle Side
• * Statistical Analysis System
• SASE – Self-Addressed Stamped Envelope
• SASO – Stability and Support Operations
• SASOL – Suid A'frikaanse Steenkool en Oli.e.
• SAT
• * formerly Scholastic Aptitude Test and Scholastic Assessment Test; now known solely by the initials
• * Small Arms Trainer
• SATB – Soprano Alto Tenor bass
• SATNAV – Satellite Navigation
• SATs – Standard Assessment Tasks and other similar terms describing tests used in English schools; see National Curriculum assessment#Terminology
• SAU – Saudi Arabia
• SAVAK – Sazamane Etelaat va Amniate Kechvar
• SAW
• * ṣallā -llāhu ʿalayhī (wa-ʾālihī) wa-sallama, an honorific suffix within Islam for Muhammad
• * Submerged arc welding
• * Squad Automatic Weapon
• * Surface acoustic wave
• SAWE – Society of Allied Weight Engineers
• SAWS – alternate form of the Islamic honorific suffix for Muhammad

SB

• Sb – Antimony
• SbA - Stibarsen, an alloy of antimony and arsenic
• SB
• * Sexy Bitch
• * Sexy Bastard
• * Sexy Boy (disambiguation)
• * Solomon Islands
• * Special Warfare Boat Operator
• SBA
• * Santa Barbara Airport
• * Simulation-Based Acquisition
• * Small Business Administration
• * Sovereign Base Area
• * Student bar association
• SBB – German for the Swiss Federal Railways
• SBC
• * Sensotronic Brake Control
• * Single-Board Computer
• * Southern Baptist Convention
• * Sun Belt Conference
• SBCCOM – U.S. Army Soldier and Biological Chemical Command
• SBCS – Single-Byte Character Set
• SBCT – Stryker Brigade Combat Team
• SBD
• * Solomon Islands dollar
• * Silent But Deadly
• SBP
• * Samahang Basketbol ng Pilipinas
• * U.S. School Breakfast Program
• * Society of Business Practitioners
• * State Bank of Pakistan
• SBS
• * Special Boat Service
• * Special Broadcasting Service
• * Seoul Broadcasting System
• SBW
• * Sonny Bill Williams

SC

• sc – Sardinian language
• Sc – Scandium
• SC
• * Cruiser Submarine c Saint Kitts and Nevis
• * Seychelles
• * South Carolina
• SCA
• * Service Contract Act
• * Sexual Compulsives Anonymous
• * Society for Creative Anachronism
• SCAP – Supreme Commander Allied Powers
• sccm – Standard cubic centimetre per minute
• sccs – Standard cubic centimetre per second
• scfh – Standard cubic foot per hour
• scfm – Standard cubic foot per minute
• scfs – Standard cubic foot per second
• SCG – Serbia and Montenegro
• SCHIMS – Soldier Combat Helmet Identification Marking System
• SCHIP – State Children's Health Insurance Program
• SciFi – Science Fiction
• sCJD – Sporadic Creutzfeldt–Jakob disease
• SCM – Surface Contamination Module
• SCMODS – State, County, Municipal Offender Data System
• SCN – Suprachiasmatic Nucleus
• SCNT – Somatic Cell Nuclear Transfer
• SCO
• * Santa Cruz Operation
• * Scotland
• * Shanghai Cooperation Organisation
• SCOTUS – Supreme Court of the United States
• SCR – Seychelles rupee
• SCRAM – Safety Control Rod Axe Man
• SCS
• * Scan Correlated Shift
• * Soil Conservation Service
• SCSI
• * Small Computer System Interface
• * Strategic and Combat Studies Institute
• SCT – Scattered Sky
• SCTP – Stream Control Transmission Protocol
• Scuba – Self Contained Underwater Breathing Apparatus
• SCUF – Slow Continuous Ultrafiltration
• SCUFN – Sub-Committee on Undersea Feature Names

SD

• sd – Sindhi language
• SD
• * Secure Digital
• * Sheriff's department
• * Smoke/Decontamination
• * South Dakota
• * Sudan
• SDC
• * Shaft Driven Compressor
• * U.S. Army Strategic Defense Command
• SDG – Sudanese pound
• SDG – Sum Dum Goy - greasy spoon chinese restaurant
• SDH – Synchronous Digital Hierarchy
• SDHC – Secure Digital High Capacity
• SDHL - Svenska damhockeyligan
• SDI – see entry
• SDN – Sudan
• SDO – Scattered Disc Object
• SDP – Social Democratic Party
• SDR – Strategic Defence Review
• SDRAM – Synchronous Dynamic Random-Access Memory
• SDS – Students for a Democratic Society
• SDSS – Sloan Digital Sky Survey
• SDXC – Secure Digital eXtended Capacity

SE

• se – Northern Sami language
• Se – Selenium
• SE
• * Seychelles
• * Societas Europaea
• * South-east
• * Sweden
• * Synthetic Environment
• * System Engineering
• SEAD – Suppression of Enemy Air Defence
• SEADI – Senior Executioner of Approved Driving Instructors
• SEAFDEC – Southeast Asian Fisheries Development Center
• SEAL – SEa-Air-Land
• SEAT – Sociedad Española de Automóviles de Turismo
• SEATO – Southeast Asia Treaty Organization
• SeaWiFS – Sea-Viewing Wide Field of View Sensor
• SEC
• * U.S. Securities and Exchange Commission
• * Security
• * Southeastern Conference
• SECaaS - Security-as-a-Service
• SECAM – Séquentiel couleur à mémoire
• SECDEF – Secretary of Defense
• SED – CERDEC Software Engineering Directorate
• SEDRIS – Synthetic Environment Data Representation and Interchange Specification
• SEE – Small Emplacement Excavator
• SEG – Society of Exploration Geophysicists
• SEG – Special Escort Group
• SEK – Swedish krona
• Selkent – South East London & Kent Bus Company
• SELT – Single Ended Line Test
• SEM
• * Sensor Employment Manager
• * Switch to Email Mode, i.e. stop texting as it is more disruptive by making a sound or vibrating and email instead, for a given time
• SEN
• * Senegal
• * Small Extension Node
• SEP
• * Somebody Else's Problem
• * Spherical Error Probable
• * System Enhancement Package
• * System Engineering Plan
• SEPTA – Southeastern Pennsylvania Rapid-Transit Authority
• SERE – Survival, Evasion, Resistance and Escape
• SESSPE – Submarine Escape and Surface Survival Personnel Equipment
• SET – Staphylococcal EnteroToxin
• SETI – Search for ExtraTerrestrial Intelligence
• SETAC – Society for Environmental Toxicology and Chemistry
• SEU
• * Single Event Upset
• * Slightly Enriched Uranium
• * Special Evidence Unit

SF

• SF
• * Fleet Submarine
• * San Francisco
• * Science fiction
• * South Africa
• * Speculative fiction
• * Special Forces
• SFA
• * Sales force automation
• * Saturated fatty acid
• * Scottish Football Association
• * Stephen F. Austin (State University)
• * Sudan Football Association
• SFE
• * Supercritical fluid extraction
• * Sydney Futures Exchange
• SFF – Standard File Format
• sf&f – Science fiction & fantasy
• SFIO
• * French Section of the Workers' International
• * Serious Fraud Investigation Office
• SFM – Switch to Facebook Mode, i.e. to message someone on Facebook instead of texting as it is less disruptive in the sense of the phone not making sound or vibrating, for a period of time
• SFOB – Special Forces Operations Base
• SFOR – UN Stabilisation Force
• SFU – Simon Fraser University

SG

• sg – Sango language
• Sg – Seaborgium
• SG
• * Senegal
• * Singapore
• * Snow Grains
• * Study Group
• SGC
• * Server Gated Cryptography
• * Stargate Command
• SGD – Singapore dollar
• SGML – Standard Generalized Markup Language
• SGP – Singapore
• SGS
• * South Georgia and the South Sandwich Islands
• * Svalbard Ground Station
• * Société Générale de Surveillance

SH

• SH
• * Saint Helena
• * SONATRACH
• * Shanghai
• SHAC
• * Stop Huntingdon Animal Cruelty
• SHAPE – Supreme Headquarters Allied Powers Europe
• SHF – Super High Frequency
• SHN – Saint Helena
• SHO – Showtime
• SHOALS – Scanning Hydrographic Operational Airborne Lidar Survey
• SHORAD – Short Range Air Defence
• SHORADEZ – SHORAD Engagement Zone
• SHP – Saint Helena pound
• SHRA – Rain Showers
• SHSN – Snow Showers

SI

• si – Sinhala language
• Si – Silicon
• SI
• * Slovenia
• * Socialist International
• * Sports Illustrated
• * Système International
• SIA – Singapore Airlines
• SIA – Survivors of Incest Anonymous
• SIAM – Society for Industrial and Applied Mathematics
• SIC – Standard Industrial Classification
• SICS – Swedish Institute of Computer Science
• SIDS – Sudden infant death syndrome
• SIDU – select, insert, delete, update. See Create, read, update and delete
• SIF – Selective Identification Feature
• SIFF – Successor IFF
• SIG
• * Schweizerische Industrie Gesellschaft. See also SIG Sauer, a firearms manufacturer spun off from the aforementioned company in 2000.
• * .signature
• * Special Interest Group
• * Strasbourg Illkirch-Graffenstaden Basket
• SIGCAT – Special Interest Group for CD-ROM Applications and Technology
• SIGINT – Signals Intelligence
• SIGMET – Significant Meteorological Information
• SIIT
• * Saskatchewan Indian Institute of Technologies
• * Sirindhorn International Institute of Technology
• * Stateless IP/ICMP Translation algorithm
• SIMAC – Semantic Interaction with Music Audio Contents
• SIMLAS – Soldier Integrated Multipurpose Laser System
• SIMM – Single In-line Memory Module
• SIMNET – SIMulator NETwork, later SIMulation NETwork
• SIMNET-D - SIMNET-Developmental
• SIMP – Strongly Interacting Massive Particle
• SIMPLE
• * Satellite Interactive Multimedia Platform for Low-cost Earth stations
• * Savings Incentive Match Plan for Employees
• * Standard Interface for Multiple Platform Link Evaluation
• sin – Sinhala language
• SIN – Social insurance number
• SINCGARS – SINgle Channel Ground and Airborne Radio System
• SIP
• * Session Initiation Protocol
• * State Implementation Plan
• * System Improvement Program
• * Systematic investment plan
• SIPP – Self-Invested Personal Pension
• Siri – Speech Interpretation and Recognition Interface
• SIRI – Service Interface for Real Time Information
• SIRS — Systemic inflammatory response syndrome
• SiS – Silicon Integrated Systems
• SIS – UK Secret Intelligence Service
• SISO
• *
• *
• SIW – Simulation Interoperability Workshop
• SIYSS –

SJ

• SJ
• * Svalbard and Jan Mayen
• * Societas Iesu
• * Statens Järnvägar
• SJA – Staff Judge Advocate
• SJC – Supreme Judicial Court of Massachusetts
• SJM – Svalbard and Jan Mayen
• SJW – Social Justice Warrior

SK

• sk – Slovak language
• SK
• * Saskatchewan
• * Slovakia
• SKC – Clear Sky
• SKK – Slovak koruna
• SKM – Sikkim
• SKU - Stock Keeping Unit

SL

• sl – Slovene language
• SL
• * Sierra Leone
• * Start Line
• SLA
• * Service Level Agreement
• * Symbionese Liberation Army
• SLAA – Sex and Love Addicts Anonymous
• SLAC – Stanford Linear Accelerator Center
• SLAN – sine loco, anno, nomine
• SLAP – Saboted light armor penetrator
• SLAPP – Strategic lawsuit against public participation
• SLB – Solomon Islands
• SLBM – Sea/Submarine-Launched Ballistic Missile
• SLC – Scan Line Corrector
• SLE – Sierra Leone
• SLI/SLi
• * Scan-Line Interleave
• * Scalable Link Interface
• SLIT – SubLingual ImmunoTherapy
• slk – Slovak language
• SLL – Sierra Leone leone
• SLO – Slovenia
• SLOC
• * Sea Lines Of Communication
• * Source Lines Of Code
• SLORC – State Law and Order Restoration Council
• SLP
• * Sea Level Pressure
• * Super Long Play
• slph – Standard litre per hour
• slpm – Standard litre per minute
• slps – Standard litre per second
• SLR – Single-Lens Reflex
• SLT
• * Single Lens Translucent
• * Speech and language therapist
• * Solid Logic Technology
• * Swing Landing Trainer
• * Secondary lymphoid tissue
• slv – Slovenian language
• SLV – El Salvador

SM

• sm – Samoan language
• Sm – Samarium
• SM
• * Sado-Masochism
• * San Marino
• * Soldier's Manual
• * Submarine Minelayer
• SMA – Scan Mirror Assembly
• SMART - many different meanings
• SMASS –
• SMCT – Soldier's Manual of Common Tasks
• SMD – Surface Mount Device
• SMDR – Station Message Detail Recording
• sme – Northern Sami language
• SME
• * Scan Mirror Electronics
• * Subject Matter Expert
• SMG
• * Sequential Motorsport Gearbox
• * SubMachine Gun
• SMH – Shaking My Head
• SMil – Sadomasochisterne i landet
• SMIL – Synchronized Multimedia Integration Language
• smo – Samoan language
• SMP – Standard Military Pattern
• SM&R – Source, Maintenance, and Recoverability
• SMR – San Marino
• SMS – many, including: Short message service; see entry
• SMTP – Simple Mail Transfer Protocol
• SMU – Southern Methodist University
• SMX
• * many, including: Server Macro Expansion
• * Solaris MINIX
• * Spatial multiplexing
• * Sulfamethoxazole; see entry
• SMZ
• * many, including: Silver Mt. Zion
• * Sulfamethazine
• * Sulfamethoxazole; ''see entry''

SN

• sn – Shona language
• Sn – Tin
• SN
• * Senegal
• * Singapore
• * Snow
• * SuperNova
• * Screen Name
• sna – Shona language
• SNAFU – "Situation Normal — All Fouled/Fucked Up"
• SNAP – Supernova/Acceleration Probe
• SNCB – Société nationale des chemins de fer de Belgique
• SNCF – Société nationale des chemins de fer français
• snd – Sindhi language
• SND – Standard Nomenclature Database
• SNE – Synthetic Natural Environment
• SNES – Super Nintendo Entertainment System
• SNÉTA – Syndicat national pour l'étude des transports aériens
• SNG – Satellite News Gathering
• SNL
• * Saturday Night Live
• * Società Navigazione del Lago di Lugano
• SNM – Special Nuclear Material
• SNMP – Simple Network Management Protocol
• SNOBOL – StriNg Oriented symBOlic Language
• SNP – Single-nucleotide polymorphism
• SNR
• * SuperNova Remnant
• * Signal-to-Noise Ratio
• SNRI – Serotonin-Norepinephrine Reuptake Inhibitor
• SNS – Spallation Neutron Source
• SNU – Solar Neutrino Unit

SO

• so – Somali language
• SO
• * Shared Object
• * Sheriff's Office
• * Significant other
• * Somalia
• SOA
• * service-oriented architecture
• * Society of Actuaries
• * State of the art
• SOAP
• * Simple Object Access Protocol
• * Supplemental Offer and Acceptance Program
• SOB
• * Son Of a Bitch
• * Same Old Bullshit
• SOC – Sector Operations Centre
• Soccsksargen – South Cotabato, Cotabato, Sultan Kudarat, Sarangani, General Santos
• SOCOM – Special Operations Command
• SoCon – Southern Conference
• SOD
• * School Of Dentistry
• * Statement Of Difference
• * Statement Of Direction
• * Statement Of Documentation
• * Statement Of Duty/Duties
• SOE
• * Secret Of Evermore
• * Special Operations Executive
• * State Of Emissions
• SOF
• * Special Operations Force(s)
• * Status of Forces
• SOFIA – Stratospheric Observatory For Infrared Astronomy
• SOGAT
• * Society of Graphical and Allied Trades
• * Former British printing union
• SOHC – Single-OverHead-Cam engine
• SOHO – Solar and Heliospheric Observatory
• SOI
• * Signal Operating Instruction
• * Southern Oscillation Index
• SOL – Shit Out of Luck
• SOLIS – Synoptic Optical Long-term Investigations of the Sun
• som – Somali language
• SOM
• * Simulation Object Model
• * Somalia
• Sonar – SOund Navigation And Ranging
• SOP
• * Standing/Standard Operating Procedure
• * State of Play
• SOR
• * State Of Readiness
• * Statement Of Requirements
• SOS
• * Somali shilling
• * Save Our Souls
• SOSTAR – Stand-Off Surveillance and Target Acquisition Radar
• sot – Sotho language
• SOUTHAG – Southern Army Group
• SOUTHCOM – Southern Command
• SOV – Single Occupant Vehicle
• SOW – Statement Of Work
• SOWHAT – RESNA Subcommittee on Wheelchairs and Transportation
• SOX – Sarbanes–Oxley Act

SP

• Sp
• * Special
• * Spring tide
• * sine prole
• SP
• * Security Police
• * Self-Propelled
• * Shore Patrol
• * Spain
• * Start Point
• * Strong Point
• spa – Spanish language
• SPA - Single Page Application
• SPAAG – Self-Propelled Anti-Aircraft Gun
• SPAC - Saratoga Performing Arts Center
• SPACECOM – Space Command
• SPAL – Società Polisportiva Ars et Labor, Italian football club
• Spaser – Surface plasmon amplification by stimulated emission of radiation
• SPC – Secretariat of the Pacific Community
• SPCA - Society for the Prevention of Cruelty to Animals
• SPCO – Single-Pole Change Over
• SPD
• * Shimano Pedaling Dynamics
• * Sozialdemokratische Partei Deutschlands
• SPDT – Single-Pole Double-Throw
• SPEAC – Stop Primate Experiments at Cambridge
• SPECTRE – SPecial Executive for Counter-intelligence, Terrorism, Revenge and Extortion
• S.P.E.A.R. - Spontaneous Protection Enabling Accelerated Response
• SPEED – Subsistence Preparation by Electronic Energy Diffusion
• SPIE – originally the Society for Photo-Optical Instrumentation Engineers
• SPL
• * Scottish Premier League
• * Superior Parietal Lobule
• * Sound pressure level
• SPM – Saint Pierre and Miquelon
• SPOD – Sea Port of Debarkation
• SPOE – Sea Port of Embarkation
• SPOT – Satellite pour l'observation de la Terre
• SPQR – Senatus Populusque Romanus
• sps – sine prole superstite
• SPS – Standard Positioning Service
• SPST – Single-Pole Single-Throw

SQ

• sq – Albanian language
• SQ – Sound Quality
• SQ – Standard Quality
• sqi – Albanian language
• SQL – Structured Query Language
• SQS - Amazon Simple Queue Service
• SQUID – Superconducting QUantum Interference Device
• SQOR – Succinate:Quinone OxidoReductase, enzyme superfamily including quinone-linked succinate dehydrogenase and fumarate reductase

SR

• sr – Serbian language
• Sr – Strontium
• SR
• * Sound Reinforcement
• * Supply Route
• * Suriname
• * Sveriges Radio
• SR – Sustained release of a drug
• SRAM
• * Scott (King), Ray (Day), SAM (Patterson) — founders of bicycle component manufacturer SRAM Corporation
• * Static Random Access Memory
• SR-ATGW – Short-Range Anti-Tank Guided Weapon
• SRB – Solid Rocket Booster
• SRBM – Short-Range Ballistic Missile
• SRC – Scheduled Removal Component
• srd – Sardinian language
• SRD
• * Science Requirements Document
• * Surinam dollar
• SRE - Site Reliability Engineer
• SREL – Savannah River Ecology Laboratory
• SRG
• * SACEUR Rover Group
• * Special Republican Guard
• SRGW – Short-Range Guided Weapon
• SRL
• * Savannah River Laboratory
• * Single Rocket Launcher
• * Survival Research Labs
• SRM – Specified Risk Material
• srp – Serbian language
• SRS – Savannah River Site
• SRTP –

SS

• ss – Swati language
• SS
• * Sand Storm
• * Schutzstaffel
• * U.S. Secret Service
• * Spanish Ship
• * Stainless steel
• * Stockholm Skins
• * Submarine
• * Super Sport
• * Surface-to-Surface
• SSA
• * Cargo Submarine
• * Social Security Administration
• * Statistics South Africa
• SSB – Single-sideband modulation
• SSB – Sacramento Sustainable Business
• SSBN – Nuclear-Powered Ballistic Missile Submarine
• SSC
• * Safe, Sane, Consensual
• * Secondary Somatosensory Cortex
• * Smaller-Scale Contingency
• * U.S. Army Soldiers System Center
• * Superconducting Super Collider
• SSCCATAGAPP – Singles, Seniors, Childless Couples, And Teens And Gays Against Parasitic Parents
• SSD
• * Solid-state drive
• * South Sudan
• SSDC – U.S. Space and Strategic Defense Command
• SSDD
• * Same Shit, Different Day
• * Single-Sided Double-Density
• SSE
• * South-southeast
• * Streaming SIMD Extensions
• SSG – Guided Missile Submarine
• SSGN – Nuclear-Powered Guided Missile Submarine
• SSH – Saffir-Simpson Hurricane scale
• SSK – Hunter-Killer Submarine
• SSKP – Single-Shot Kill Probability
• SSL – Secure Sockets Layer
• SSM – Surface-to-Surface (Guided) Missile
• SSN
• * Nuclear-Powered Attack Submarine
• * SIM Serial Number
• * Social Security Number
• * Socialist Solidarity Network
• * Subsystem number
• SSNW – Same Shit, New Wrapping
• SSO – Submarine Oiler
• SSP – Submarine Transport
• SSR
• * Radar Picket Submarine
• * Solid State Recorder
• SSRI
• * Selective Serotonin Reuptake Inhibitor
• * Social Systems Research Institute
• SSRN
• * Social Science Research Network
• * Nuclear-Powered Radar Picket Submarine
• SSS
• * Siding Spring Survey
• * Side Side Side
• * Sigue Sigue Sputnik
• S/SSM – Surface-to-Subsurface Missile
• SST
• * SuperSonic Transport
• * Training Submarine
• * Saturated Suction Temperature
• SSTO – Single-Stage To Orbit
• SSV – Soft-Skinned Vehicle
• ssw – Swati language
• SSW – South South-West

ST

• st – Sotho language
• ST
• * Saint Lucia
• * São Tomé and Príncipe
• STA
• * Scheduled Time of Arrival
• * Surveillance and Target Acquisition
• STAG – Strategy and Tactics Group
• STAGE – Scenario Toolkit And Generation Environment
• STANAG – Standardisation Agreement
• STAR
• * Scientific and Technical Aerospace Reports
• * Simulation of Tactical Alternative Responses
• * Special Threat Analysis and Recognition
• STAT
• * Signal Transducers and Activators of Transcription
• * Special Tertiary Admissions Test
• STB - Surface Transportation Board
• STC – Superior Temporal Cortex
• S&TCD – CERDEC Space and Terrestrial Communications Directorate
• STD
• * São Tomé and Príncipe dobra
• * Sexually Transmitted Disease
• STDM – Statistical Time Division Multiplexing
• STEM
• * Scanning transmission electron microscopy
• * Science, technology, engineering, and mathematics
• * Spatiaotemporal Epidemiological Modeler
• STENTOR – Satellite de télécommunications pour expérimenter de nouvelles technologies en orbite
• STFU
• * Southern Tenant Farmers Union
• * Stuff You
• * "Shut the fuck up!"
• STH – Sonic the Hedgehog
• STI
• * Sexually Transmitted Infection
• * Subaru Tecnica International
• STK –
• STM – Short Term Memory
• STOL – Short Take-Off and Landing
• STOVL – Short Take-Off and Vertical Landing
• STP
• * São Tomé and Príncipe
• * Standard Temperature and Pressure
• STR – Short Tandem Repeat
• STRATCOM – United States Strategic Command
• STRICOM
• * U.S. Army Simulation, Training & Instrumentation Command
• * Strike Command
• STRIVE – Synthetic Tactical Real-time Interactive Virtual Environment
• STSM – Senior Technical Staff Member
• Stuka – ''Sturzkampfflugzeug''

SU

• su – Sundanese language
• SU
• * Soviet Union
• * Sudan
• SUB – Student Union Building
• SuD – Subject under Discussion
• SUDC – Swedish United Dawah Center, a salafist Islamic organisation in Sweden
• SUI
• * Sonic user interface
• * Switzerland
• SUK – Start Up Kit
• sun – Sundanese language
• SUN –
• * Soviet Union
• * Stanford University Network that led to Sun Microsystems
• SUNY – State University of New York
• SUR – Suriname
• SURTASS – Surveillance Towed Array Sensor System
• SUSAT – Sight Unit Small Arms, Trilux
• SUV – Sport Utility Vehicle

SV

• sv – Swedish language
• SV
• * El Salvador
• * Sportverein
• SVC – Secondary Visual Cortex
• SvD – Svenska Dagbladet
• SVD
• * Singular Value Decomposition
• * Snaiperskaya Vintovka Dragunova
• SVG – Scalable Vector Graphics
• SVK – Slovakia
• SVM
• * Stroboscopic effect Visibility Measure; a measure for assessing a type of temporal light artefacts
• * Support Vector Machine
• SVN – Slovenia
• SVO – subject–verb–object
• SVR – ''Sluzhba Vneshney Razvedki''

SW

• sw – Swahili language
• SW
• * South-West ordinal direction
• * Sweden
• * Shortwave
• * Star Wars
• swa – Swahili language
• SWA
• * Secure Web Access
• * South-West Asia
• SWAC – Southwestern Athletic Conference
• SWAG
• * Scientific wild-ass guess, slang for a rough estimate based on expert experience
• * Sourceware Archive Group, a free collection of classified source code and sample programs written in Pascal
• *Sport Writers Association of Ghana, Sports Writers Association based in Ghana
• * Special Warfare Group, a former name used by the Naval Special Operations Command
• * "Supporters Without A Game", sport slang spun off from WAGs
• SWALK – Sealed With A Loving Kiss
• SWAN – System for Wearable Audio Navigation
• SWAP – Surface Waters Acidification Programme
• SWAPO – South-West Africa People's Organisation
• SWAT – Special Weapons And Tactics
• swe – Swedish language
• SWE – Sweden
• SWF
• * Shockwave Flash file
• * Single White Female
• SWG
• * Surface Warfare Group
• * Symbology Working Group
• SWHR – Society for Women's Health Research
• SWIG – Simplified Wrapper and Interface Generator
• SWIR – Short Wave InfraRed
• SWLABR – "She Was Like A Bearded Rainbow", a song by the band Cream
• SWORD – Subjective WORkload Dominance
• SWORDS – Special Weapons Observation Reconnaissance Detection System
• SWOT – Strengths, Weaknesses, Opportunities, Threats
• SWP
• * Special Working Party
• * Systematic Westing Plan
• * Skill with prize
• SWT – Sea Water Tank
• SWV – Sisters With Voices
• SWZ – Swaziland

SX

• SX – Sonic X
• SXM
• * Sint Maarten
• * Stream X-Machine

SY

• SY – Syria
• SYC – Seychelles
• SYLK – Microsoft 'Symbolic Link' data file format
• SYP – Syrian pound
• SYR – Syria
• Syriza – Synaspismós Rizospastikís Aristerás
• SysML – System Modeling Language
• Sysop – System Operator

SZ

• SZ
• * Swaziland
• * Switzerland
• SZL – Swaziland lilangeni