| Acronym | Meaning |
 | OBS | Observe |
| UNDK | Undock |
| PSIA | Pound Per Square Inch Absolute |
| IITCS | Igloo Internal Thermal Control Section |
| FM | Flight Model |
| ALAE | Atmospheric Lyman Alpha Experiment |
| MPS | Main Propulsion System (Subsystem) |
| SGLS | Space-ground Link System |
| OESS | Orbiter/ET Separation Subsystem |
| FP | Freezing Point |
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