| Acronym | Meaning |
 | P | Primary |
| UMVF | Unmanned Vertical Flight |
| ORSDI | Oak Ridge Selective Dissemination Of Information |
| HYPACE | Hybrid Programmable Attitude Control Electronics |
| MSG | Message |
| MO | Master Oscillator |
| TPUN | Test Procedure Update Notice |
| URN | Urine |
| SSPD | Shuttle System Payload Description |
| OFS | OrbiterFunctionalSimulator |
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