| Acronym | Meaning |
| MD | Manual Direct |
| LOU | Input/Output Unit |
| EVSC | Extravehicular Suit Communications |
| CRSFD | Crossfeed |
| GSIU | Ground Standard Interface Unit |
| TX | Translation Hand Controller X-Axis Direction |
| ETA | Environmental Test Article |
| LAT | Lateral |
| BSDP | Booster Stage Discharge Pressure |
| GCU | Generator Control Unit |