| Abbreviation | Definition |
|---|---|
| TF | Test Facility |
| TF | Test Fixture |
| TFC | Time From Cutoff |
| TFE | Time From Event |
| TFF | Time to Free Fall |
| TFG | Transfer Frame Generator |
| TFI | Time From Ignition |
| TFL | Telemetry Format Load |
| TFL | Time From Launch |
| TFOV | Total Field of View |
| TFR | Trouble and Failure Report |
| TFS | Telemetry Format Selection |
| TFU | Technical Follow-Up |
| TFU | Test Facility Utilization |
| TG | Technical Director office, Ground Systems Directorate |
| TGA | Thermo-Gravimetric Analysis |
| TGA | Trace Gas Analyzer |
| TGC | Temporal Gain Correction |
| TGO | Time to Go |
| TGOWG | Teleoperator Ground Operations Working Group |