| 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 |
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