| Abbreviation | Definition |
|---|---|
| TGS | Rate Gyro Assembly |
| TGS | Telemetry Ground Station |
| TGS | Telemetry Ground System |
| TGS | Timeline Generation System |
| TGS | TriGlycine Sulfate |
| TGSE | Telemetry Ground Support Equipment |
| THC | Translation Hand Controller |
| THC | Translational Hand Controller |
| THDS | Time Homogeneous Data Set |
| THEMIS | THermal EMission Imaging System |
| THEMIS | Time History of Events and Macroscale Interactions During Substorms |
| THEO | Theoretical |
| THERM | Thermal |
| THOLD | Threshold |
| THOUS | Thousand |
| THP | Thrust HorsePower |
| THROT | Throttle |
| TI | Information Systems (KSC Directorate) |
| TI | Technical Integration |
| TI | Terminal Initiation Rendezvous Maneuver |