| Acronym | Meaning |
 | SSM/I | Special Sensor Microwave Imager |
| SSM/I | Special Sensor For Microwave/Imaging |
| SSM/R | Special Sensor Microwave Radiometer |
| SSM/T | Special Sensor Microwave Temperature |
| SSS | Safety And Site Services |
| SSS | Software Segment Specification |
| SSSF | Surface Sounding Systems Facility |
| SST | Sea Surface Temperature |
| SST | Scalable Spectral Tool |
| SST | Supersonic Transport |
| SSTS | Sea Surface Temperatures |
| SSTS | Sea Surface Temperatures |
| SSU | Stratospheric Sounding Unit |
| STA | System Technology Associates |
| STAC | Scientific And Technological Activities Commission |
| STACS | Subtropical Atlantic Climate Studies |
| STAMP | Second Thunderstorm And Microburst Project |
| STARE | Southern Tropical Atlantic Regional Experiment |
| STC | Sensitivity Time Control |
| STC | Society For Technical Communication |
| STD | Salinity |
| STEM | Science Technology Engineering And Mathematics |
| STEM | Scanning-transmission Electron Microscope |
| STEP | Stratosphere-Troposphere Exchange Project |
| STEP | Solar Terrestrial Energy Program |
| STEPS | Severe Thunderstorm Electrification And Precipitation Study |
| STERAO | Stratosphere-Troposphere Experiments |
| STF | Short-Term Forecast |
| STI | Scientific & Technical Information |
| STIP | Study Of Traveling Interplanetary Phenomena |
| STIWG | Satellite Telemtry Interagency Working Group |
| STJ | Subtropical Jet |
| STK | StorageTek |
| STL | Space Technology Laboratory |
| STOL | Short Takeoff And Landing |
| STORM | Stormscale Operational And Research Meteorology |
| STORM DAWG | STORM Data Assimilation Working Group |
| STORM-FEST | STORM Fronts Experiment Systems Test |
| STP | Solar Terrestrial Physics |
| STP | Standard Temperature And Pressure |
| STRADAP | Storm Radar Data Processor |
| STRATCOM | Stratospheric Composition Experiment |
| STRATEX | Stratocumulus Experiment |
| STRATRAD | Strategic Management Of Research And Development |
| STREX | Storm Transfer And Response Experiment |
| STS | Seasonal Transition Simulation |
| STS | Space Transportation System |
| STSP | Solar Terrestrial Science Programme |
| STSP | Solar Terrestrial Science Programme |
| STT | Small Tactical Terminal |
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