| Acronym | Meaning |
| UR | Upper Right |
| VPHD | Vertical Payload Handling Device |
| FEID | Functional Engineering Interface Device |
| S/S | Subsystem |
| RSU | Remote ServiceUnit |
| POI | Propellant Quantity Indicator |
| RCS | Reaction Control System (Subsystem) |
| MUSS | Module Utility Support Structure |
| HAA | High Altitude Abort |
| TLC | Telecommand |