| SAB |
Services Ancillary to Broadcasting |
| SAP |
Services Ancillary to Programme making |
| SAP |
Satellite Action Plan |
| SAP-REG |
Satellite Action Plan Regulatory Group |
| SAR |
Search and Rescue |
| SAR |
Synthetic Aperture Radar |
| SARP |
ICAO Standards and Recommended Practices |
| SARSAT |
Satellite-Aided Search and Rescue Project |
| SAT |
Satellite |
| SATCOM |
Satellite Communications (USA) |
| SBS |
Strict Band Segmentation |
| SC |
Special Committee on Regulatory/Procedural Matters (ITU) |
| SCAR |
Scientific Committee on Antarctic Research |
| SCOPE |
Scientific Committee on Problems of the Environment |
| SCOSTEP |
Scientific Committee on Solar Terrestrial Physics |
| SCPT |
Single channel per transponder |
| SCT |
Scientific Committee on Telecommunications (URSI) |
| S-DAB |
Satellite Digital Audio Broadcasting |
| SDARS |
Satellite Direct Audio Radio Service |
| SDMA |
Space Division Mulitple Access |
| SDR |
Software Digital Radio |
| SE |
(Working Group) Spectrum Engineering (ECC) |
| SERC |
Science and Engineering Council (GB) |
| SES |
Satellite Earth Stations and Systems |
| SES |
Ship Earth Station |
| SESC |
Space Environment Service Center |
| SETI |
Search for Extra Terrestrial Intelligence |
| SFCG |
Space Frequency Coordination Group |
| SFS |
Standard Frequency and Time Signal Service |
| SFTSS |
Standard Frequency and Time Signal-Satellite Service |
| SGLS |
Space-Groundlink Subsystem |
| SHF |
Super High Frequency (3 to 30 GHz) |
| SITE |
Satellite Instructional Television Experiment |
| SKA |
Square Kilometer Array |
| SMR |
Sub-Millimeter Radiometer |
| SMS |
Short Message Service |
| SNG |
Satellite News Gathering |
| SO |
Space Operation Service |
| SOLAS |
Safety of Life at Sea |
| SOS |
Space Operation Service |
| SPAC |
Spectrum Planning and Advisory Committee (USA) |
| S-PCS |
Satellite Personal Communication Services |
| SPFD |
Spectral Power Flux Density (dB[Watts.m-2.Hz-1]) |
| SPIE |
International Society for Optical Engineering |
| SPS |
Spectrum Planning Subcommittee (USA) |
| SR |
Space Research |
| SRBR |
Short Range Business Radio |
| SRD |
Short Range Device |
| SRD/MG |
Short Range Device Maintenance Group (CEPT) |
| SRR |
Short Range Radar |
| SRS |
Space Research Service |
| SSB |
Space Science Board (of the US NAS) |
| SSC |
Swedish Space Corporation |
| SSR |
Secondary Surveillance Radar |
| SSR |
Surface Search Radar |
| SWAS |
Submillimeter Wave Astronomy Satellite (NASA) |
Committee on Radio Astronomy Frequencies