(Main list of acronyms)

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  • 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 – (i) Sianel Pedwar Cymru (Welsh, "Channel Four Wales")
  • S3 - (i) Alternative to SSS (e.g. Amazon S3)

SA

  • sa – (s) Sanskrit language (ISO 639-1 code)
  • SA
  • (i) Salvation Army
  • (s) Sand (METAR Code)
  • Saudi Arabia (ISO 3166 and FIPS 10-4 country's code digram)
  • (i) Sexaholics Anonymous
  • Sexual assault
  • (i) sine anno (Latin, "without year")
  • Single Adult, a designation in the LDS Church for unmarried individuals 18 and older
  • Situational awareness
  • South Africa
  • (i/s) South Australia (postal symbol)
  • (i) Standards Australia
  • Sturmabteilung (German, "Storm Detachment", Nazi forerunner and rival of SS)
  • S.A. – designation for a corporation in many European countries; see article for meanings
  • SAA
  • (i) 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 – (a) Svenska Aeroplan AB (Swedish aircraft manufacturer; also refers to its former auto manufacturing arm)
  • SAAFR – (a/i) Standard use Army Aircraft Flight Route ("safer")
  • SAAMI – (a) Sporting Arms and Ammunition Manufacturers' Institute ("sammy")
  • SAARC – (i) South Asian Association for Regional Cooperation
  • SAB – (i) Soprano Alto Baritone
  • Sabena – (a) Société anonyme belge d'exploitation de la navigation aérienne (French for "Belgian Company for Exploiting Aerial Navigation", 1923–2001)
  • SABIC – (p) Saudi Basic Industries Corporation
  • SABR – (a) Society for American Baseball Research
  • SAC
  • (a) Standards Activity Committee (of SISO)
  • U.S. Strategic Air Command (1946–1992)
  • SACAT – (a) Semi Attended Customer Activated Terminal (Supermarket checkout)
  • SACEUR – (p) Supreme Allied Commander EURope
  • SACF - Semi Automatic Capsule Filler source
  • SACLANT – (p) Supreme Allied Commander atLANTic
  • SACLOS – (a) Semi-Automatic Command to Line of Sight
  • SAD
  • (s) Safford Regional Airport (IATA code)
  • (a) Seasonal Affective Disorder
  • Situational Awareness Display
  • SADD – (a) originally Students Against Drunk Driving, now Students Against Destructive Decisions (U.S. national school-related group)
  • SADL
  • (a) Situation Awareness Data Link ("saddle")
  • Structural Architecture Description Language
  • SADT - (i) Substance Abuse Day Treatment
  • SAE
  • (i) Society of Automotive Engineers
  • Stamped addressed envelope
  • SAFER – (a) Steel And Foam Energy Reduction
  • SAFETY – (a) Stopping Adults Facilitating the Exploitation of Today's Youth
  • SAFICT – (a) Software Agents as Facilitators of Interoperability in Collective Training
  • sag – (s) Sango language (ISO 639-2 code)
  • SAG
  • (a/i) Screen Actors Guild
  • Surface Action Group
  • SAG-AFTRA – (a) Screen Actors Guild–American Federation of Television and Radio Artists
  • SAGAT – (a) Situation Awareness Global Assessment Technique
  • SAGE – (a) Semi-Automatic Ground Environment (simulation)
  • SAHB – (a) Sensational Alex Harvey Band
  • SAIC – (i) Science Applications International Corporation
  • SALT
  • (a/i) Save A Life Today (SALT) Alert; Emergency Contact System
  • (a) Southern African Large Telescope
  • Strategic Arms Limitation Talks
  • SAM
  • (a) Sequential-Access Memory
  • Sociedad Aeronáutica de Medellín
  • Surface-to-Air Missile
  • Sambo – (p/a) Samooborona bez oruzhiya (Russian: "Самооборона без оружия", literally "self-defense without weapons")
  • SAML – (a) Security Assertion Markup Language ("sam-ell")
  • SANZAAR – (a) South Africa, New Zealand, Australia and Argentina Rugby
  • san
  • (s) Sanskrit language (ISO 639-2 code)
  • (a) Storage Area Network
  • SAO - (more than 20 alternatives)
  • SAR
  • (s) Saudi riyal (ISO 4217 currency code)
  • (a) Search And Rescue
  • Special Administrative Region
  • Synthetic Aperture Radar
  • SARA
  • (a) Southeastern Association for Research in Astronomy
  • Scientific Atlanta Resident Application
  • Scottish Amateur Rowing Association
  • Southern African Railway Association
  • State Administration for Religious Affairs
  • SARP – (a) Search And Rescue Processor
  • SARR – (i/a) Search And Rescue Repeater
  • SARS – (a) Severe Acute Respiratory Syndrome
  • SART
  • (a) Search and Rescue Transponder
  • Situational Awareness Rating Technique
  • SARU – (i) South African Rugby Union
  • SAS
  • (i) Scandinavian Airlines System
  • Second Avenue Subway
  • Situational Awareness System
  • Special Air Service
  • Studies, Analysis and Simulation
  • Side Angle Side
  • (a) Statistical Analysis System (original meaning; SAS Institute Inc. has evolved far beyond that scope)
  • SASE – (i) Self-Addressed Stamped Envelope
  • SASO – (a) Stability and Support Operations
  • SASOL – (p) Suid Afrikaanse Steenkool en Oli.e. (Afrikaans, "South African Coal and Oil")
  • SAT
  • (i) formerly Scholastic Aptitude Test and Scholastic Assessment Test; now known solely by the initials
  • Small Arms Trainer
  • SATB – (i) Soprano Alto Tenor bass
  • SATNAV – (p) Satellite Navigation (Increasingly common GPS based system in new vehicles)
  • SATs – (a) Standard Assessment Tasks and other similar terms describing tests used in English schools; see National Curriculum assessment#Terminology
  • SAU – (s) Saudi Arabia (ISO 3166 trigram)
  • SAVAK – (a) Sazamane Etelaat va Amniate Kechvar (Iranian "Security and Intelligence Service")
  • SAW
  • (i) ṣallā -llāhu ʿalayhī (wa-ʾālihī) wa-sallama (Arabic: صَلَّىٰ ٱللَّٰهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ, "God bless him [and his family] and grant him peace"), an honorific suffix within Islam for Muhammad
  • (a) Submerged arc welding
  • Squad Automatic Weapon
  • Surface acoustic wave
  • SAWE – (a) Society of Allied Weight Engineers
  • SAWS – (i) alternate form of the Islamic honorific suffix for Muhammad (see SAW)

SB

  • Sb – (s) Antimony (Latin Stibium)
  • SbA - Stibarsen, an alloy of antimony and arsenic
  • SB
  • (i) Sexy Bitch
  • Sexy Bastard
  • Sexy Boy (disambiguation)
  • (s) Solomon Islands (ISO 3166 digram)
  • (i) Special Warfare Boat Operator
  • SBA
  • (i) Santa Barbara Airport
  • Simulation-Based Acquisition
  • Small Business Administration
  • Sovereign Base Area
  • Student bar association
  • SBB – (i) German for the Swiss Federal Railways
  • SBC
  • (i) Sensotronic Brake Control
  • Single-Board Computer
  • Southern Baptist Convention
  • Sun Belt Conference (US college sports)
  • SBCCOM – (p) U.S. Army Soldier and Biological Chemical Command (disbanded 2003)
  • SBCS – (i) Single-Byte Character Set
  • SBCT – (i) Stryker Brigade Combat Team
  • SBD
  • (s) Solomon Islands dollar (ISO 4217 currency code)
  • Silent But Deadly
  • SBP
  • (i) Samahang Basketbol ng Pilipinas (Filipino, "Basketball Federation of the Philippines")
  • U.S. School Breakfast Program
  • Society of Business Practitioners
  • State Bank of Pakistan
  • SBS
  • (i) Special Boat Service
  • Special Broadcasting Service
  • Seoul Broadcasting System
  • SBW
  • (i) Sonny Bill Williams (New Zealand dual-code rugby player)

SC

  • sc – (s) Sardinian language (ISO 639-1 code)
  • Sc – (s) Scandium
  • SC
  • (s) Cruiser Submarine (US Navy hull classification) c Saint Kitts and Nevis (FIPS 10-4 country code; from Saint Christopher)
  • Seychelles (ISO 3166 digram)
  • South Carolina (postal symbol)
  • SCA
  • (i) Service Contract Act
  • Sexual Compulsives Anonymous
  • Society for Creative Anachronism
  • SCAP – (a) Supreme Commander Allied Powers (Allied occupation of Japan)
  • sccm – (s) Standard cubic centimetre per minute (unit of measurement of fluid flow)
  • sccs – (s) Standard cubic centimetre per second (unit of measurement of fluid flow)
  • scfh – (s) Standard cubic foot per hour (unit of measurement of fluid flow)
  • scfm – (s) Standard cubic foot per minute (unit of measurement of fluid flow)
  • scfs – (s) Standard cubic foot per second (unit of measurement of fluid flow)
  • SCG – (s) Serbia and Montenegro (ISO 3166 trigram; defunct since 2006)
  • SCHIMS – (i) Soldier Combat Helmet Identification Marking System
  • SCHIP – (a) State Children's Health Insurance Program (U.S.; often pronounced "ess-chip")
  • SciFi – Science Fiction
  • sCJD – (i) Sporadic Creutzfeldt–Jakob disease
  • SCM – (i) Surface Contamination Module
  • SCMODS – (s) State, County, Municipal Offender Data System
  • SCN – (p) Suprachiasmatic Nucleus
  • SCNT – (i) Somatic Cell Nuclear Transfer
  • SCO
  • (i) Santa Cruz Operation (initials later used by SCO Group)
  • (s) Scotland (FIFA trigram; not eligible for an ISO 3166 or IOC trigram)
  • (a) Shanghai Cooperation Organisation
  • SCOTUS – (a) Supreme Court of the United States
  • SCR – (s) Seychelles rupee (ISO 4217 currency code)
  • SCRAM – (a) Safety Control Rod Axe Man
  • SCS
  • (i) Scan Correlated Shift
  • Soil Conservation Service
  • SCSI
  • (a) Small Computer System Interface ("scuzzy")
  • (i) Strategic and Combat Studies Institute
  • SCT – (s) Scattered Sky (METAR Code)
  • SCTP – (i) Stream Control Transmission Protocol
  • Scuba – (a) Self Contained Underwater Breathing Apparatus
  • SCUF – Slow Continuous Ultrafiltration
  • SCUFN – (i) Sub-Committee on Undersea Feature Names (of GEBCO)

SD

  • sd – (s) Sindhi language (ISO 639-1 code)
  • SD
  • (i) Secure Digital (memory card format)
  • Sheriff's department
  • Smoke/Decontamination
  • (s) South Dakota (postal symbol)
  • Sudan (ISO 3166 digram)
  • SDC
  • (i) Shaft Driven Compressor
  • U.S. Army Strategic Defense Command (1985–1992)
  • SDG – (s) Sudanese pound (ISO 4217 currency code)
  • SDG – (i) Sum Dum Goy - greasy spoon chinese restaurant
  • SDH – (i) Synchronous Digital Hierarchy
  • SDHC – (i) Secure Digital High Capacity
  • SDHL - (i/p) Svenska damhockeyligan (Swedish, "Swedish Women's Hockey League")
  • SDI – see entry
  • SDN – (s) Sudan (ISO 3166 trigram)
  • SDO – (i) Scattered Disc Object
  • SDP – (i) Social Democratic Party (European politics)
  • SDR – (i) Strategic Defence Review
  • SDRAM – (i) Synchronous Dynamic Random-Access Memory ("ess-dee-ram")
  • SDS – (i) Students for a Democratic Society
  • SDSS – (i) Sloan Digital Sky Survey
  • SDXC – (p) Secure Digital eXtended Capacity

SE

  • se – (s) Northern Sami language (ISO 639-1 code)
  • Se – (s) Selenium
  • SE
  • (s) Seychelles (FIPS 10-4 country code)
  • (i) Societas Europaea (form of business organization in the EU)
  • South-east
  • (s) Sweden (ISO 3166 digram)
  • (i) Synthetic Environment
  • Systems engineering
  • SEAD – (i) Suppression of Enemy Air Defence(s)
  • SEADI – (i) Senior Executioner of Approved Driving Instructors
  • SEAFDEC – (p) Southeast Asian Fisheries Development Center
  • SEAL – (p) SEa-Air-Land
  • SEAT – (a) Sociedad Española de Automóviles de Turismo (Spanish for "Spanish Touring Car Company")
  • SEATO – (a) Southeast Asia Treaty Organization
  • SeaWiFS – (p) Sea-Viewing Wide Field of View Sensor (satellite instrument)
  • SEC
  • (i) U.S. Securities and Exchange Commission
  • (p) Security
  • Southeastern Conference
  • SECaaS - (p) Security-as-a-Service
  • SECAM – (a) Séquentiel couleur à mémoire (French for "Colour Sequential with Memory"; TV standard, cf. NTSC, PAL)
  • SECDEF – (p) (U.S.) Secretary of Defense
  • SED – (i) CERDEC Software Engineering Directorate
  • SEDRIS – (a) Synthetic Environment Data Representation and Interchange Specification
  • SEE – (a) Small Emplacement Excavator
  • SEG – (i) Society of Exploration Geophysicists
  • SEG – (i) Special Escort Group
  • SEK – (s) Swedish krona (ISO 4217 currency code)
  • Selkent – (p) South East London & Kent Bus Company
  • SELT – (a) Single Ended Line Test (ing)
  • SEM
  • (i/a) 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
  • (s) Senegal (ISO 3166 trigram)
  • (i) Small Extension Node
  • SEP
  • (i) Somebody Else's Problem
  • Spherical Error Probable
  • System Enhancement Package
  • System Engineering Plan
  • SEPTA – (i) Southeastern Pennsylvania Rapid-Transit Authority
  • SERE – (i) Survival, Evasion, Resistance and Escape
  • SESSPE – (a) Submarine Escape and Surface Survival Personnel Equipment
  • SET – (p) Staphylococcal EnteroToxin
  • SETI – (a) Search for ExtraTerrestrial Intelligence
  • SETAC – (a) Society for Environmental Toxicology and Chemistry
  • SEU
  • (i) Single Event Upset (solid state physics)
  • Slightly Enriched Uranium
  • Special Evidence Unit<!--Cognitive modelling: ECHO Seinfild-->

SF

  • SF
  • (s) Fleet Submarine (retired US Navy hull classification)
  • (i) San Francisco
  • Science fiction
  • (s) South Africa (FIPS 10-4 country code)
  • (i) Speculative fiction
  • Special Forces
  • SFA
  • (i) Sales force automation
  • Saturated fatty acid
  • Scottish Football Association
  • Stephen F. Austin (State University)
  • Sudan Football Association
  • SFE
  • (i) Supercritical fluid extraction
  • Sydney Futures Exchange
  • SFF – (i) Standard File Format
  • sf&f – (i) Science fiction & fantasy
  • SFIO
  • (i) French Section of the Workers' International (former party)
  • (i) Serious Fraud Investigation Office (India)
  • 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 – (i) Special Forces Operations Base
  • SFOR – (p) UN Stabilisation Force (in Bosnia and Herzegovina)
  • SFU – (i) Simon Fraser University (Canada)

SG

  • sg – (s) Sango language (ISO 639-1 code)
  • Sg – (s) Seaborgium
  • SG
  • (s) Senegal (FIPS 10-4 country code)
  • Singapore (ISO 3166 digram)
  • Snow Grains (METAR Code)
  • (i) Study Group
  • SGC
  • (i) Server Gated Cryptography
  • (p) Stargate Command
  • SGD – (s) Singapore dollar (ISO 4217 currency code)
  • SGML – (i) Standard Generalized Markup Language
  • SGP – (s) Singapore (ISO 3166 trigram)
  • SGS
  • (s) South Georgia and the South Sandwich Islands (ISO 3166 trigram)
  • (i) Svalbard Ground Station (Landsat)
  • Société Générale de Surveillance

SH

  • SH
  • (s) Saint Helena (ISO 3166 digram)
  • (p) SONATRACH (Algerian petroleum company)
  • Shanghai
  • SHAC
  • (a) Stop Huntingdon Animal Cruelty
  • SHAPE – (a) Supreme Headquarters Allied Powers Europe
  • SHF – (i) Super High Frequency
  • SHN – (s) Saint Helena (ISO 3166 trigram)
  • SHO – (a) Showtime (see also sho.com)
  • SHOALS – (a) Scanning Hydrographic Operational Airborne Lidar Survey
  • SHORAD – (p) Short Range Air Defence
  • SHORADEZ – (p) SHORAD Engagement Zone
  • SHP – (s) Saint Helena pound (ISO 4217 currency code)
  • SHRA – (s) Rain Showers (METAR Code)
  • SHSN – (s) Snow Showers (METAR Code)

SI

  • si – (s) Sinhala language (ISO 639-1 code)
  • Si – (s) Silicon
  • SI
  • (s) Slovenia (ISO 3166 and FIPS 10-4 country code digram)
  • (i) Socialist International
  • Sports Illustrated
  • Système International (French, International System of Units)
  • SIA – (s) Singapore Airlines (ICAO code)
  • SIA – (i) Survivors of Incest Anonymous
  • SIAM – (i) Society for Industrial and Applied Mathematics
  • SIC – (a) Standard Industrial Classification
  • SICS – (a/i) Swedish Institute of Computer Science
  • SIDS – (a) Sudden infant death syndrome
  • SIDU – (i) select, insert, delete, update. See Create, read, update and delete
  • SIF – (i) Selective Identification Feature
  • SIFF – (i) Successor IFF
  • SIG
  • (i) Schweizerische Industrie Gesellschaft (German, "Swiss Industry Company"). See also SIG Sauer, a firearms manufacturer spun off from the aforementioned company in 2000.
  • (p) .signature (UNIX shell/Internet standard file name)
  • (a/i) Special Interest Group
  • (a/i) Strasbourg Illkirch-Graffenstaden Basket (French basketball club)
  • SIGCAT – (a) Special Interest Group for CD-ROM Applications and Technology
  • SIGINT – (p) Signals Intelligence
  • SIGMET – (p) Significant Meteorological Information
  • SIIT
  • (i) Saskatchewan Indian Institute of Technologies (Canadian university)
  • Sirindhorn International Institute of Technology (Thai university)
  • Stateless IP/ICMP Translation algorithm
  • SIMAC – (a) Semantic Interaction with Music Audio Contents
  • SIMLAS – (p) Soldier Integrated Multipurpose Laser System
  • SIMM – (a) Single In-line Memory Module
  • SIMNET – (p) SIMulator NETwork, later SIMulation NETwork
  • SIMNET-D - (p) SIMNET-Developmental
  • SIMP – (a) Strongly Interacting Massive Particle
  • SIMPLE
  • (a) Satellite Interactive Multimedia Platform for Low-cost Earth stations
  • (p) Savings Incentive Match Plan for Employees (as used in SIMPLE IRA)
  • (a) Standard Interface for Multiple Platform Link Evaluation (NATO STANAG 5602)
  • sin – (s) Sinhala language (ISO 639-2 code)
  • SIN – (a) Social insurance number (Canada)
  • SINCGARS – (p) SINgle Channel Ground and Airborne Radio System
  • SIP
  • (i) Session Initiation Protocol
  • State Implementation Plan
  • System Improvement Program
  • Systematic investment plan
  • SIPP – (a) Self-Invested Personal Pension
  • Siri – (a) Speech Interpretation and Recognition Interface (Apple iOS software)
  • SIRI – (a) Service Interface for Real Time Information
  • SIRS — (a) Systemic inflammatory response syndrome
  • SiS – (i) Silicon Integrated Systems
  • SIS – (i) UK Secret Intelligence Service (also known as MI6)
  • SISO
  • (a) Simulation Interoperability Standards Organization
  • Society of Independent Show Organizers
  • SIW – (i) Simulation Interoperability Workshop
  • SIYSS – (i) Stockholm International Youth Science Seminar

SJ

  • SJ
  • (s) Svalbard and Jan Mayen (ISO 3166 digram)
  • (i) Societas Iesu (Latin: The Society of Jesus, the Jesuit order)
  • (i) Statens Järnvägar (Swedish State Railways)
  • SJA – (i) Staff Judge Advocate (military law)
  • SJC – (i) Supreme Judicial Court of Massachusetts (note: the highest court in the state of Maine is also called the Supreme Judicial Court)
  • SJM – (s) Svalbard and Jan Mayen (ISO 3166 trigram)
  • SJW – (i) Social Justice Warrior

SK

  • sk – (s) Slovak language (ISO 639-1 code)
  • SK
  • (s) Saskatchewan (postal symbol)
  • Slovakia (ISO 3166 digram)
  • SKC – (s) Clear Sky (METAR Code)
  • SKK – (s) Slovak koruna (ISO 4217 currency code)
  • SKM – (s) Sikkim (ISO 3166 trigram; obsolete 1975)
  • SKU - (i) Stock Keeping Unit

SL

  • sl – (s) Slovene language (ISO 639-1 code)
  • SL
  • (s) Sierra Leone (ISO 3166 and FIPS 10-4 country code digram)
  • (i) Start Line
  • SLA
  • (i) Service Level Agreement
  • Symbionese Liberation Army
  • SLAA – (i) Sex and Love Addicts Anonymous
  • SLAC – (a) Stanford Linear Accelerator Center
  • SLAN – (i) sine loco, anno, nomine (Latin, "without place, year, or name")
  • SLAP – (a) Saboted light armor penetrator (type of firearms ammunition)
  • SLAPP – (a) Strategic lawsuit against public participation
  • SLB – (s) Solomon Islands (ISO 3166 trigram)
  • SLBM – (i) Sea/Submarine-Launched Ballistic Missile
  • SLC – (i) Scan Line Corrector
  • SLE – (s) Sierra Leone (ISO 3166 trigram)
  • SLI/SLi
  • (i/s) Scan-Line Interleave
  • Scalable Link Interface
  • SLIT – (p) SubLingual ImmunoTherapy
  • slk – (s) Slovak language (ISO 639-2 code)
  • SLL – (s) Sierra Leone leone (ISO 4217 currency code)
  • SLO – (s) Slovenia (IOC trigram, but not FIFA or ISO 3166)
  • SLOC
  • (a) Sea Lines Of Communication
  • Source Lines Of Code
  • SLORC – (a) State Law and Order Restoration Council (of Burma)
  • SLP
  • (i) Sea Level Pressure
  • (i) Super Long Play
  • slph – (s) Standard litre per hour (air flow)
  • slpm – (s) Standard litre per minute (air flow)
  • slps – (s) Standard litre per second (air flow)
  • SLR – (i) Single-Lens Reflex (camera)
  • SLT
  • (i) Single Lens Translucent
  • (i) Speech and language therapist
  • (i) Solid Logic Technology (electronics)
  • Swing Landing Trainer (paratroops)
  • (i) Secondary lymphoid tissue
  • slv – (s) Slovenian language (ISO 639-2 code)
  • SLV – (s) El Salvador (ISO 3166 trigram)

SM

  • sm – (s) Samoan language (ISO 639-1 code)
  • Sm – (s) Samarium
  • SM
  • (i) Sado-Masochism
  • (s) San Marino (ISO 3166 and FIPS 10-4 country code digram)
  • (i) Soldier's Manual
  • (s) Submarine Minelayer (US Navy hull classification)
  • SMA – (i) Scan Mirror Assembly
  • SMART - many different meanings
  • SMASS – (a) Small Main-Belt Asteroid Spectroscopic Survey
  • SMCT – (i) Soldier's Manual of Common Tasks
  • SMD – (i) Surface Mount Device
  • SMDR – (i) Station Message Detail Recording
  • sme – (s) Northern Sami language (ISO 639-2 code)
  • SME
  • (i) Scan Mirror Electronics
  • Subject Matter Expert
  • SMG
  • (i) Sequential Motorsport Gearbox
  • SubMachine Gun
  • SMH – (a) Shaking My Head
  • SMil – (a) Sadomasochisterne i landet (Danish SM organisation)
  • SMIL – (a) Synchronized Multimedia Integration Language
  • smo – (s) Samoan language (ISO 639-2 code)
  • SMP – (i) Standard Military Pattern
  • SM&R – (i) Source, Maintenance, and Recoverability
  • SMR – (s) San Marino (ISO 3166 trigram)
  • SMS – many, including: Short message service; see entry
  • SMTP – (i) Simple Mail Transfer Protocol
  • SMU – (i) Southern Methodist University
  • SMX
  • many, including: (i) Server Macro Expansion
  • (p) Solaris MINIX
  • (p) Spatial multiplexing
  • (p) Sulfamethoxazole; see entry
  • SMZ
  • many, including: (i) Silver Mt. Zion
  • (p) Sulfamethazine
  • (p) Sulfamethoxazole; see entry

SN

  • sn – (s) Shona language (ISO 639-1 code)
  • Sn – (s) Tin (Latin Stannum)
  • SN
  • (s) Senegal (ISO 3166 digram)
  • Singapore (FIPS 10-4 country code)
  • Snow (METAR Code)
  • SuperNova
  • Screen Name
  • sna – (s) Shona language (ISO 639-2 code)
  • SNAFU – (a) "Situation Normal — All Fouled/Fucked Up"
  • SNAP – (p) Supernova/Acceleration Probe
  • SNCB – (i) Société nationale des chemins de fer de Belgique (French for "Belgian Railways National Society", NMBS in Dutch)
  • SNCF – (i) Société nationale des chemins de fer français (French for "French Railways National Society")
  • snd – (s) Sindhi language (ISO 639-2 code)
  • SND – (i) Standard Nomenclature Database
  • SNE – (i) Synthetic Natural Environment
  • SNES – Super Nintendo Entertainment System
  • SNÉTA – (a) Syndicat national pour l'étude des transports aériens (French for "Aerial transport Study National Syndicate", 1919–1923)
  • SNG – (i) Satellite News Gathering (television)
  • SNL
  • (i) Saturday Night Live (television)
  • (i) Società Navigazione del Lago di Lugano
  • SNM – (i) Special Nuclear Material
  • SNMP – (i) Simple Network Management Protocol
  • SNOBOL – (p) StriNg Oriented symBOlic Language
  • SNP – (i) Single-nucleotide polymorphism
  • SNR
  • (i) SuperNova Remnant
  • Signal-to-Noise Ratio
  • SNRI – (i) Serotonin-Norepinephrine Reuptake Inhibitor
  • SNS – (i) Spallation Neutron Source
  • SNU – (i) Solar Neutrino Unit

SO

  • so – (s) Somali language (ISO 639-1 code)
  • SO
  • (i) Shared Object (Unix)
  • Sheriff's Office
  • Significant other
  • (s) Somalia (ISO 3166 and FIPS 10-4 country code digram)
  • SOA
  • (a) service-oriented architecture
  • (a) Society of Actuaries
  • (i) State of the art
  • SOAP
  • (a) Simple Object Access Protocol
  • Supplemental Offer and Acceptance Program (U.S. medical residency matching)
  • SOB
  • (i) Son Of a Bitch
  • Same Old Bullshit
  • SOC – (a) Sector Operations Centre
  • Soccsksargen – (p) South Cotabato, Cotabato, Sultan Kudarat, Sarangani, General Santos (a region in the Philippines; pronounced "sock-sar-gen")
  • SOCOM – (p) (U.S.) Special Operations Command
  • SoCon – (p) Southern Conference (U.S. college sports)
  • SOD
  • (i/a) School Of Dentistry
  • Statement Of Difference(s)
  • Statement Of Direction
  • Statement Of Documentation
  • Statement Of Duty/Duties
  • SOE
  • (i) Secret Of Evermore
  • Special Operations Executive (WWII British organization)
  • State Of Emissions (EW)
  • SOF
  • (a/i) Special Operations Force(s)
  • Status of Forces
  • SOFIA – (a) Stratospheric Observatory For Infrared Astronomy
  • SOGAT
  • (a) Society of Graphical and Allied Trades
  • Former British printing union
  • SOHC – (i) Single-OverHead-Cam engine
  • SOHO – (p) Solar and Heliospheric Observatory
  • SOI
  • (i) Signal Operating Instruction
  • (i) Southern Oscillation Index
  • SOL – (i) Shit Out of Luck
  • SOLIS – (i) Synoptic Optical Long-term Investigations of the Sun
  • som – (s) Somali language (ISO 639-2 code)
  • SOM
  • (a) Simulation Object Model
  • (s) Somalia (ISO 3166 trigram)
  • Sonar – (p) SOund Navigation And Ranging
  • SOP
  • (i) Standing/Standard Operating Procedure
  • State of Play
  • SOR
  • (i) State Of Readiness
  • Statement Of Requirements
  • SOS
  • (s) Somali shilling (ISO 4217 currency code)
  • Save Our Souls
  • SOSTAR – (a) Stand-Off Surveillance and Target Acquisition Radar
  • sot – (s) Sotho language (ISO 639-2 code)
  • SOUTHAG – (p) Southern Army Group
  • SOUTHCOM – (p) (U.S.) Southern Command
  • SOV – (i) Single Occupant Vehicle
  • SOW – (i) Statement Of Work
  • SOWHAT – (p) RESNA Subcommittee on Wheelchairs and Transportation
  • SOX – (p) Sarbanes–Oxley Act

SP

  • Sp
  • (p) Special
  • Spring tide (nautical charts)
  • (i) sine prole (Latin, "without offspring")
  • SP
  • (i) Security Police
  • Self-Propelled
  • Shore Patrol
  • (s) Spain (FIPS 10-4 country code)
  • (i) Start Point
  • Strong Point
  • spa – (s) Spanish language (ISO 639-2 code)
  • SPA - Single Page Application
  • SPAAG – (a) Self-Propelled Anti-Aircraft Gun
  • SPAC - Saratoga Performing Arts Center
  • SPACECOM – (p) (U.S.) Space Command
  • SPAL – (a) Società Polisportiva Ars et Labor ("Art & Labor Sports Club", with the "SP" from Italian and "AL" from Latin), Italian football club
  • Spaser – (a) Surface plasmon amplification by stimulated emission of radiation
  • SPC – (i) Secretariat of the Pacific Community
  • SPCA - Society for the Prevention of Cruelty to Animals
  • SPCO – (i) Single-Pole Change Over
  • SPD
  • (i) Shimano Pedaling Dynamics
  • Sozialdemokratische Partei Deutschlands (Social Democratic Party of Germany)
  • SPDT – (i) Single-Pole Double-Throw
  • SPEAC – (a) Stop Primate Experiments at Cambridge (later became SPEAK)
  • SPECTRE – SPecial Executive for Counter-intelligence, Terrorism, Revenge and Extortion
  • S.P.E.A.R. - Spontaneous Protection Enabling Accelerated Response
  • SPEED – (a) Subsistence Preparation by Electronic Energy Diffusion (early military microwave oven)
  • SPIE – (i) originally the Society for Photo-Optical Instrumentation Engineers ("SPIE – The International Society for Optical Engineering" 1981–2007, "SPIE" since 2007)
  • SPL
  • (i) Scottish Premier League
  • Superior Parietal Lobule
  • Sound pressure level
  • SPM – (s) Saint Pierre and Miquelon (ISO 3166 trigram)
  • SPOD – (a/i) Sea Port of Debarkation
  • SPOE – (a/i) Sea Port of Embarkation
  • SPOT – (a) Satellite pour l'observation de la Terre (French, "Satellite for Earth Observation")
  • SPQR – (i) Senatus Populusque Romanus (Latin "The Senate and the People of Rome")
  • sps – (i) sine prole superstite (Latin, "without surviving issue")
  • SPS – (i) Standard Positioning Service (GPS)
  • SPST – (i) Single-Pole Single-Throw

SQ

  • sq – (s) Albanian language (ISO 639-1 code)
  • SQ – (i) Sound Quality
  • SQ – (i) Standard Quality
  • sqi – (s) Albanian language (ISO 639-2 code)
  • SQL – (i/a) Structured Query Language ("seek-well")
  • SQS - Amazon Simple Queue Service
  • SQUID – (p) Superconducting QUantum Interference Device
  • SQOR – (p) Succinate:Quinone OxidoReductase, enzyme superfamily including quinone-linked succinate dehydrogenase and fumarate reductase

SR

  • sr – (s) Serbian language (ISO 639-1 code)
  • Sr – (s) Strontium
  • SR
  • (i) Sound Reinforcement
  • Supply Route
  • (s) Suriname (ISO 3166 digram)
  • (i) Sveriges Radio (Swedish Radio Ltd)
  • SR – (i) Sustained release of a drug
  • SRAM
  • (p) Scott (King), Ray (Day), SAM (Patterson) — founders of bicycle component manufacturer SRAM Corporation
  • (p) Static Random Access Memory ("ess-ram")
  • SR-ATGW – (i) Short-Range Anti-Tank Guided Weapon
  • SRB – (i) Solid Rocket Booster
  • SRBM – (i) Short-Range Ballistic Missile (cf. IRBM, ICBM)
  • SRC – (i) Scheduled Removal Component
  • srd – (s) Sardinian language (ISO 639-2 code)
  • SRD
  • (i) Science Requirements Document
  • (s) Surinam dollar (ISO 4217 currency code)
  • SRE - (i) Site Reliability Engineer(ing)
  • SREL – (i) Savannah River Ecology Laboratory
  • SRG
  • (i) SACEUR Rover Group
  • Special Republican Guard
  • SRGW – (i) Short-Range Guided Weapon
  • SRL
  • (i) Savannah River Laboratory
  • Single Rocket Launcher
  • Survival Research Labs
  • SRM – (i) Specified Risk Material(s)
  • srp – (s) Serbian language (ISO 639-2 code)
  • SRS – (i) Savannah River Site
  • SRTP – (i) [<nowiki/>Secure Real-time Transport Protocol]

SS

  • ss – (s) Swati language (ISO 639-1 code)
  • SS
  • (s) Sand Storm (METAR Code)
  • (p) Schutzstaffel (German, roughly "Protection Squadron"; Nazi elite Praetorian guard)
  • (i) U.S. Secret Service
  • Spanish Ship
  • Stainless steel
  • Stockholm Skins
  • (s) Submarine (US Navy hull classification)
  • (i) Super Sport
  • Surface-to-Surface (missile)
  • SSA
  • (s) Cargo Submarine (US Navy hull classification)
  • (i) Social Security Administration (U.S.)
  • Statistics South Africa
  • SSB – (a) Single-sideband modulation
  • SSB – (i) Sacramento Sustainable Business
  • SSBN – (s) Nuclear-Powered Ballistic Missile Submarine (US Navy hull classification)
  • SSC
  • (i) Safe, Sane, Consensual (SM phrase)
  • Secondary Somatosensory Cortex
  • Smaller-Scale Contingency
  • U.S. Army Soldiers System Center (Natick, Massachusetts)
  • Superconducting Super Collider
  • SSCCATAGAPP – Singles, Seniors, Childless Couples, And Teens And Gays Against Parasitic Parents (fictional organization from The Simpsons)
  • SSD
  • (i) Solid-state drive
  • (s) South Sudan (ISO 3166 trigram)
  • SSDC – (i) U.S. Space and Strategic Defense Command
  • SSDD
  • (i) Same Shit, Different Day
  • Single-Sided Double-Density (floppy disk)
  • SSE
  • (s) South-southeast
  • (i) Streaming SIMD Extensions
  • SSG – (s) Guided Missile Submarine (retired US Navy hull classification)
  • SSGN – (s) Nuclear-Powered Guided Missile Submarine (US Navy hull classification)
  • SSH – (i) Saffir-Simpson Hurricane scale
  • SSK – (s) Hunter-Killer Submarine (retired US Navy hull classification)
  • SSKP – (i) Single-Shot Kill Probability
  • SSL – (i) Secure Sockets Layer
  • SSM – (i) Surface-to-Surface (Guided) Missile
  • SSN
  • (s) Nuclear-Powered Attack Submarine (US Navy hull classification)
  • (i) SIM Serial Number
  • Social Security Number (U.S.)
  • Socialist Solidarity Network
  • Subsystem number (SCCP, SS7)
  • SSNW – (i) Same Shit, New Wrapping
  • SSO – (s) Submarine Oiler (retired US Navy hull classification)
  • SSP – (s) Submarine Transport (retired US Navy hull classification)
  • SSR
  • (s) Radar Picket Submarine (retired US Navy hull classification)
  • (i) Solid State Recorder
  • SSRI
  • (i) Selective Serotonin Reuptake Inhibitor
  • Social Systems Research Institute
  • SSRN
  • (i) Social Science Research Network
  • (s) Nuclear-Powered Radar Picket Submarine (retired US Navy hull classification)
  • SSS
  • (i) Siding Spring Survey
  • Side Side Side (an acronym for remembering congruent triangles)
  • (i) Sigue Sigue Sputnik (band)
  • S/SSM – (i) Surface-to-Subsurface Missile
  • SST
  • (i) SuperSonic Transport
  • (s) Training Submarine (US Navy hull classification)
  • Saturated Suction Temperature (refrigeration cycles)
  • SSTO – (i) Single-Stage To Orbit
  • SSV – (i) Soft-Skinned Vehicle (i.e., unarmoured)
  • ssw – (s) Swati language (ISO 639-2 code)
  • SSW – (s) South South-West

ST

  • st – (s) Sotho language (ISO 639-1 code)
  • ST
  • (s) Saint Lucia (FIPS 10-4 country code)
  • São Tomé and Príncipe (ISO 3166 digram)
  • STA
  • (i) Scheduled Time of Arrival
  • Surveillance and Target Acquisition
  • STAG – (a) (U.S.) Strategy and Tactics Group
  • STAGE – (a) Scenario Toolkit And Generation Environment
  • STANAG – (p) (NATO) Standardisation Agreement
  • STAR
  • (a) Scientific and Technical Aerospace Reports (NASA)
  • Simulation of Tactical Alternative Responses
  • Special Threat Analysis and Recognition
  • STAT
  • (a) Signal Transducers and Activators of Transcription (cell biology)
  • Special Tertiary Admissions Test (Australia)
  • STB - Surface Transportation Board
  • STC – (i) Superior Temporal Cortex
  • S&TCD – (i) CERDEC Space and Terrestrial Communications Directorate
  • STD
  • (s) São Tomé and Príncipe dobra (ISO 4217 currency code)
  • (i) Sexually Transmitted Disease
  • STDM – (i) Statistical Time Division Multiplexing
  • STEM
  • (a) Scanning transmission electron microscopy
  • Science, technology, engineering, and mathematics
  • (p) Spatiaotemporal Epidemiological Modeler (IBM-developed software)
  • STENTOR – (p) Satellite de télécommunications pour expérimenter de nouvelles technologies en orbite (French, "Orbital New Technology Experimental Telecommunications Satellite")
  • STFU
  • (i) Southern Tenant Farmers Union
  • Stuff You
  • "Shut the fuck up!"
  • STH – Sonic the Hedgehog
  • STI
  • (i) Sexually Transmitted Infection
  • Subaru Tecnica International
  • STK – (i) Satellite Tool Kit
  • STM – (i) Short Term Memory
  • STOL – (i) Short Take-Off and Landing
  • STOVL – (i) Short Take-Off and Vertical Landing
  • STP
  • (s) São Tomé and Príncipe (ISO 3166 trigram)
  • (i) Standard Temperature and Pressure
  • STR – (i) Short Tandem Repeat (DNA analysis)
  • STRATCOM – (p) United States Strategic Command
  • STRICOM
  • (p) U.S. Army Simulation, Training & Instrumentation Command (1992&ndash;)
  • Strike Command (1962&ndash;1971)
  • STRIVE – (a) Synthetic Tactical Real-time Interactive Virtual Environment
  • STSM – (i) Senior Technical Staff Member
  • Stuka – (p) Sturzkampfflugzeug (German WWII dive bomber)

SU

  • su – (s) Sundanese language (ISO 639-1 code)
  • SU
  • (s) Soviet Union (ISO 3166 digram; obsolete 1992)
  • Sudan (FIPS 10-4 country code)
  • SUB – (i) Student Union Building
  • SuD – (a) Subject under Discussion
  • SUDC – Swedish United Dawah Center, a salafist Islamic organisation in Sweden
  • SUI
  • (a) Sonic user interface
  • (s) Switzerland (IOC and FIFA trigram, but not ISO 3166)
  • SUK – Start Up Kit
  • sun – (s) Sundanese language (ISO 639-2 code)
  • SUN – (s)
  • Soviet Union (ISO 3166 trigram; obsolete 1992)
  • Stanford University Network that led to Sun Microsystems
  • SUNY – (a) State University of New York (usually pronounced "sue-knee")
  • SUR – (s) Suriname (ISO 3166 trigram)
  • SURTASS – (p) Surveillance Towed Array Sensor System
  • SUSAT – (a) Sight Unit Small Arms, Trilux
  • SUV – (i) Sport Utility Vehicle

SV

  • sv – (s) Swedish language (ISO 639-1 code)
  • SV
  • (s) El Salvador (ISO 3166 digram)
  • (p) Sportverein (German for "Sport Association", as in Hamburger SV and SV Werder Bremen)
  • SVC – (i) Secondary Visual Cortex
  • SvD – (p) Svenska Dagbladet (Swedish newspaper)
  • SVD
  • (i) Singular Value Decomposition
  • Snaiperskaya Vintovka Dragunova (Снайперская винтовка Драгунова, Russian for "Dragunov Sniper Rifle")
  • SVG – (i) Scalable Vector Graphics
  • SVK – (s) Slovakia (ISO 3166 trigram)
  • SVM
  • (p) Stroboscopic effect Visibility Measure; a measure for assessing a type of temporal light artefacts
  • (i) Support Vector Machine (artificial intelligence)
  • SVN – (s) Slovenia (ISO 3166 and FIFA trigram)
  • SVO – (i) subject–verb–object
  • SVR – (i) Sluzhba Vneshney Razvedki (Служба Внешней Разведки, Russian for "Foreign Intelligence Service")

SW

  • sw – (s) Swahili language (ISO 639-1 code)
  • SW
  • (s) South-West ordinal direction
  • Sweden (FIPS 10-4 country code)
  • (a) Shortwave
  • Star Wars
  • swa – (s) Swahili language (ISO 639-2 code)
  • SWA
  • (i/a) Secure Web Access
  • South-West Asia
  • SWAC – (p) 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 ("wives and girlfriends")
  • SWALK – (a) Sealed With A Loving Kiss
  • SWAN – (a) System for Wearable Audio Navigation
  • SWAP – (a) Surface Waters Acidification Programme
  • SWAPO – (a) South-West Africa People's Organisation
  • SWAT – (a) Special Weapons And Tactics
  • swe – (s) Swedish language (ISO 639-2 code)
  • SWE – (s) Sweden (ISO 3166 trigram)
  • SWF
  • (p) Shockwave Flash file ("swiff")
  • Single White Female
  • SWG
  • (i) Surface Warfare Group
  • Symbology Working Group
  • SWHR – (i) Society for Women's Health Research
  • SWIG – (a) Simplified Wrapper and Interface Generator
  • SWIR – (a/i) Short Wave InfraRed ("ss-why-are" or )
  • SWLABR – (i) "She Was Like A Bearded Rainbow", a song by the band Cream
  • SWORD – (p) Subjective WORkload Dominance
  • SWORDS – (a) Special Weapons Observation Reconnaissance Detection System
  • SWOT – (a) Strengths, Weaknesses, Opportunities, Threats (mnemonic)
  • SWP
  • (i) Special Working Party ("swipp")
  • Systematic Westing Plan (a plan of periodic westing of shares or mutual funds worth a fixed amount of money)
  • Skill with prize (UK pub quiz machines — quality titles include: Pub Quiz, Quiz City, Frog in a Liquidizer, Who Wants To Win a Tenner?)
  • SWT – (i) Sea Water Tank
  • SWV – (i) Sisters With Voices (American female R&B vocal group)
  • SWZ – (s) Swaziland (ISO 3166 trigram)

SX

  • SX – (i) Sonic X
  • SXM
  • (s) Sint Maarten (ISO 3166 trigram)
  • (i) Stream X-Machine

SY

  • SY – (s) Syria (ISO 3166 and FIPS 10-4 country code digram)
  • SYC – (s) Seychelles (ISO 3166 trigram)
  • SYLK – Microsoft 'Symbolic Link' data file format
  • SYP – (s) Syrian pound (ISO 4217 currency code)
  • SYR – (s) Syria (ISO 3166 trigram)
  • Syriza – (p) Synaspismós Rizospastikís Aristerás (Greek Συνασπισμός Ριζοσπαστικής Αριστεράς, "Coalition of the Radical Left")
  • SysML – (p) System Modeling Language
  • Sysop – (p) System Operator

SZ

  • SZ
  • (s) Swaziland (ISO 3166 digram)
  • Switzerland (FIPS 10-4 country code)
  • SZL – (s) Swaziland lilangeni (ISO 4217 currency code)

References