| Acronym | Meaning |
| SBTC | Speed Brake/thrust Controller |
| MSS | Mobile Service Structure |
| FOC | Focus |
| QUAD | Quandrangle |
| PIL | Procurement Instrument Identification |
| OFS | OrbiterFunctionalSimulator |
| DRG | Digital Ranging Generator |
| CMC | Command Module Computer |
| SACS | Systems Software Avionics Command SuPport |
| EEH | EMU Electrical Harness |