| Acronym | Meaning |
 | VX | Velocity Along The X-Axis |
 | DCPEI | DEU Control Program End Item |
 | OPB | Oxidizer Preburner |
 | PCM | Pulse Code Modulation |
 | SPS | Secondary Propulsion System |
 | NX | NOrmal To X-Axis |
 | OL | Operational Left DSC Or MDM |
 | ECG | Electrocardiograph |
 | EDDR | Electron DiPole-DiPole Reservoir |
 | PCL | Pallet Coolant Loop |