| Abbreviation | Definition |
|---|---|
| SRU | Shop-Replaceable Unit |
| SRU | Space Replaceable Units |
| SRV | Space Re-entry Vehicle |
| SRVL | Survival |
| SRW | Software Requirements Workshop |
| SS | Shuttle System |
| SS | Single Sideband |
| SS | Single String |
| SS | Space Shuttle |
| SS | Space Station |
| SS | Station Set |
| SS | Subsystem |
| SS | Sunset |
| SS | System Software |
| SS | System Summary |
| SS&A | Space Systems and Applications |
| SSA | S-band (1.98 to 2.2 GHz) Single Access |
| SSA | Shuttle Simulation Aircraft |
| SSA | Solar Survival Architecture |
| SSA | Space Suit Assembly |