| Abbreviation | Definition |
|---|---|
| SSM | Support System Module |
| SSM | Systems Support Module |
| SSM/I | Special Sensor Microwave/ Imager |
| SSMB | Space Shuttle Maintenance Baseline |
| SSMB | Space Station Manned Base |
| SSME | Space Shuttle Main Engine |
| SSMEC | Space Shuttle Main Engine Controller |
| SSMECA | Space Shuttle Main Engine Controller Assembly |
| SSN | Sun Spot Number |
| SSO | Safety Signification Operation |
| SSO | Source Selection Official |
| SSO | Space Shuttle Orbiter |
| SSO | Subsystem Operation (in Spacelab) |
| SSO | Support System for OEX |
| SSOP | Space Systems Operating Procedures |
| SSP | Small Sortie Payload |
| SSP | Space Shuttle Program |
| SSP | Space Solar Power |
| SSP | Standard Switch Panel |
| SSP | Statistical Signal Processing |