Hermanas del Buen Pastor (TOCD)
Sage Resources Ltd. - Vancouver Stock Exchange symbol
Salem Generating Station - Nuclear energy (GFGA)
Scottish Genealogy Society - United Kingdom (EAIO)
Scottish Guild of Servers - Episcopalian
Secondary Grammar School (ADA)
Secretary, General Staff - Military technology (DDF)
Secretary of the General Staff - Army
Seeley Genealogy Society (EA)
Segmented Gamma Scanner - Nuclear energy (NRCH)
Semented Gamma Scanne (DEEM)
Sighting Guidance System (SAUS)
Signal Generating Station (CET)
Simultaneous Graphics System (SAUS)
Single Green Silk (SAUS)
Single Green Silk-Covered - Wire insulation
Sisters of the Good Samaritan (ADA)
Site Ground Station (SAUS)
Societe Generale de Surveillance Holding (EFIS)
Society for General Systems (SAUS)
Society of General Surgeons (SAUS)
Society of Graduate Surgeons (NTPA)
Society of the Golden Section - Defunct (EA)
Society of the Good Shepherd - Anglican religious community
Software Generation System
Solution Gas Drive - Petroleum engineering
Song of Songs - Old Testament book - Roman Catholic canon
Spacecraft Gravity System (ACAE)
Stactic Gel Strength - Well drilling technology
Stage Golfing Society - British (BI)
Stanford Geological Survey (GIS)
Stan's Gunsmithing Service - NCIC firearms make code (NCIC)
Statistical Gathering System (SAUS)
Statistics Gathering System - NASA
Status Group Select (SAUS)
Steam Generator System - Nuclear energy (NRCH)
Steep Glide Slope (NASA)
St. George - South Carolina - Seismograph station code, US Geological Survey (SEIS)
Strain-Gauge System (SAUS)
Strategy Gaming Society (EA)
Stream Generation Statement - Computer science
Stretch Glass Society (EA)
Subgrid Scale (SAUS)
Sunderbans Game Sanctuary (SAUS)
Swiveling Gunner's Station
Swivelling Gunners Station (SAUS)
Symbol Generation and Storage - Computer science
Symbol Generator and Storage (SAUS)
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