| 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 |