| Abbreviation | Definition |
|---|---|
| TST | Test |
| TSTOL | TPOCC System Test and Operations Language |
| TSU | Time Standard Unit |
| TSW | Test Software |
| TSW | Test Switch |
| TT | Terminal Timing |
| TT | Thrust Termination |
| TT | Time-Tagged |
| TT | Total Temperature |
| TT | Total Time |
| TT&C | Telemetry, Tracking, and Command |
| TT&C | Tracking, Telemetry and Command |
| TT&C | Tracking, Telemetry and Control |
| TTA | Thermomechanical Test Area |
| TTA | Time to Apogee |
| TTB | Tandem To Booster |
| TTB | Time- Tagged Buffer |
| TTC | Telemetry, Tracking, and Command |
| TTC | Time To Circularize (Orbit) |
| TTC | Tunnel Thermal Control |