| Abbreviation | Definition |
|---|---|
| SYSTRAN | Systems Analysis Translator |
| SZA | Solar Zenith Angle |
| T | Talk/Monitor |
| T | Temperature |
| T | Temperature Rate |
| T | Test |
| T | Thermostabilized |
| T | Throttle Command |
| T | Time (liftoff) |
| T | Top |
| T | Total |
| T | Total Temperature |
| T | Transformation (Matrix), Transpose (Matrix Superscript) |
| T' | Temperature Rate of change |
| T- | Time Prior to Launch |
| T&C | Telemetry and Command |
| T&CD | Timing And CountDown |
| T&CP | Test and Checkout Procedure |
| T&D | Transportation and Docking |
| T&DA | Telemetry and Data Acquisition |