| Acronym | Meaning |
| VCG | Vertical Location Of The Center Of Gravity |
| OST | Orbiter SuPport Trolley |
| SA | Shaft Angle |
| ESS | Essential |
| BARS | Baseline Accounting And Reporting System |
| EMC | Electromagnetic Compatibility |
| USS | Utility Support Structure |
| LFOP | Landing And Ferry Operations Panel |
| HTC | Hybrid Technol Ogy ComPuter |
| DBC | Data Bus Control |