| Abbreviation | Definition |
|---|---|
| TI | Test Iteration |
| TI | Training Integrator |
| TIC | Technical Information Center |
| TIC | Total Item Change |
| TICM | Test Interface and Control Module |
| TIE | Technical Integration Engineer |
| TIE | Twin Ion Engine |
| TIFS | Total In-Flight Simulator |
| TIG | Thermal Ignition Guide |
| TIG | Time of IGnition |
| TIGER | Trans Iron Galactic Element Recorder |
| TII | Tooling Inspection Instrumentation |
| TIM | Technical Interchange Meeting |
| TIM | Thermal Interface Material |
| TIM | Time Interval Monitor |
| TIO | Target Insertion Orbit |
| TIP | Thrust Inlet Pressure |
| TIP | Time Interval Processor |
| TIRIO | Table of Incompatibilities and Requirements for the Instruments Operation |
| TIROS | Topographical Infrared Operations Satellite |