| Acronym | Meaning |
| EL | Engineering Instruction |
| FFBD | Functional Flow Block Diagram |
| MS | Material Specification |
| OFI | Operational Flight Instrumentation |
| PBAN | Polybutadiene Acrylonitrile (Propellant) |
| LL | Long Line |
| FT | Flight Team |
| OCDR | Orbiter Critical Design Review |
| MSN | Mission |
| FDRI | Flight Director Rate Indicator |