| Abbreviation | Definition |
|---|---|
| T&DS | Tracking and Data Systems/JPL |
| T&M | Time and Materials |
| T&O | Test and Operations |
| T&V | Test and Verification |
| T.B. | Toggle Buffer |
| T.P. | Transition Period |
| T/A | Turnaround |
| T/C | Telecommunications |
| T/C | Temperature Compensating |
| T/C | Termination Check |
| T/C | Thrust Chamber |
| T/CAP | Thermal Capacitor |
| T/D | Time Delay |
| T/D | Touchdown |
| T/E | Transporter/Erector |
| T/L | Talk and Listen |
| T/L | Timeline |
| T/L | Transformer Load |
| T/O | Takeover |
| T/R | Tape Recorder |