| Acronym | Meaning |
| EPS | Electrical Power System |
| MVAS | Multipurpose Ventricular Actuating System |
| HF | Hydrogen Fill |
| VOX | Voice Operated Transmitter (Transmission) |
| CDS | Closeout DoorSystem |
| EDC | Engineering Design Change |
| LOP | Input/Output Port |
| HWWS | Hyperfiltration Wash Water Recovery System |
| PCMMU | Pulse Code Modulation Master Unit |
| TTCA | Thrust Translation Controller Assembly |