| Acronym | Meaning |
 | PPM | Positions And Proper Motions (catalog) |
| OCTW | Optical Communications Through The Shuttle Window |
| HTVL | Horizontal Takeoff Vertical Landing |
| IMU | Inertial Measurement Unit |
| ANSI | American National Standards Institute |
| GST | Greenwich Sidereal Time |
| DOT | Department Of Transportation |
| TCS | Thermal Control System |
| GOX | Gaseous OXygen |
| ROUS | Rodents Of Unusual Size |
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