| Acronym | Meaning |
| P | Primary |
| GVTA | Ground Vibration Test Article |
| HGS | Hydrogen Gas Saver |
| TCR | Test Conductor |
| VEFCO | Vertical Functional Checkout |
| OPSB | Orbiter Processing SuPport Building |
| ESF | Explosive Safe Facility |
| REV | Revision |
| IAL | International Algebraic Language |
| SDCP | Summary DeveloPment Cost Plan |