| Acronym | Meaning |
| MDC | Mission Duty Cycle |
| CEDC | Cyclic Error Detection Code |
| MILLS | Modular Integrated Utility Systems |
| PEM | Plant Engineering And Maintenance |
| M | Mega |
| SSM | ESpace Shuttle Main Engine |
| MIB | Master Interconnect Board |
| MPL | Minimum Power Level (65%) |
| R | ETSReconfiguration Electrical Test Stand |
| PAD | Propellant Acquisition Device |