| Acronym | Meaning |
| AACS | Attitude And Articulation Control Subsystem |
| PC | ParseC (usu. Pc) |
| ENAP | Energetic Neutral Atom Precipitation |
| VMS | Vertical Motion Simulator |
| OMS | Orbital Maneuvering System |
| AEPI | Atmospheric Emissions Photometric Imaging |
| DIRBE | Diffuse Infrared Background Experiment |
| LH | Liquid Hydrogen |
| REM | Rat Enclosure Module |
| RCC | Reinforced Carbon-Carbon |