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 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 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) Serbo-Croatian language (ISO 639-1 code) SH (s) Saint Helena (ISO 3166 digram) (p) SONATRACH (Algerian petroleum company) Shanghai SHAC (a) Stop Huntingdon Animal Cruelty Student Health Action Coalition 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 –