| Acronym | Meaning |
 | MOR | Manufacturing Operation Record |
| S/M | Service/Maintenance |
| VRL | Vertical Reference Line |
| OSDH | Orbiter System Definition Handbook |
| LPOX | Low Pressure Oxygen |
| SPA | Signal Processor Assembly |
| MM | Millimeter |
| UPP | User Parameter Processing |
| HISAM | Hardware Initiated Standalone Memory |
| MEOP | Maximum Expected Operating Pressure |
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