| Acronym | Meaning |
| VSD | Vertical Situation Display |
| MTL | Material |
| SIS | Standard Interface Specification |
| OFS | OrbiterFunctionalSimulator |
| MTR | Motor |
| RWD | Right Wing Down |
| RDP | Requirements Development Plan |
| FOB | Flight Operations Building |
| OPR | Orbiter/Payload Recorder |
| ELF | Extremely Low Frequency (1 Hz To 3 KHz) |