| Acronym | Meaning |
| EMCD | Electro-Mechanical Control Diagram |
| AI | Artificial Intelligence |
| SRSS | Shuttle Range Safety System |
| RETRO | Retrofire |
| LA | Lanthanum |
| PWMD | Printed Wiring Master Drawing |
| PMI | Preventive Maintenance Instruction |
| NPL | Normal Power Level (see RPL) |
| TDRSS | Tracking And Data Relay Satellite System |
| DECU | Data Exchange Control Unit |