| Acronym | Meaning |
 | IPS | IRD Information Requirements Document |
| FASCOS | Flight Acceleration Safety Cutoff System |
| GRO | Gamma Ray Observatory |
| MPL | Manipulation Positioning Latches |
| ORB | Order |
| PMHL | Preferred Measurement Hardware List |
| SCS | Stabilization And Control SYstem (Subsystem) |
| CST | Crew Station Trainer |
| REPR | Repressurization |
| IUS | International Ultraviolet ExPlorer |
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