| Acronym | Meaning |
| MMS | Multimission Modular Spacecraft |
| SIS | Standard Interface Specification |
| JRB | Joint Review Board |
| IOCU | Input/Output Control Unit |
| LV | Load Vertical |
| OT | Operating Time |
| QATT | Qualification For Acceptance Thermal Testing |
| TCR | Test Conductor |
| EL | Electroluminescent |
| M | ESAModular Equipment Stowage Assembly |