| Acronym | Meaning |
| OPT | Optimum |
| CP | Chemically Pure |
| M | Maintainability |
| FU | Flight Unit |
| M | ECCA Master Electrical Common Connector Assembly |
| LPFTP | Low Pressure Fuel Turbopump |
| PGHM | Payload Ground Handling Mechanism |
| EDS | Emergency Detection System |
| CCM | E Contract Change Mass Estimate |
| OCD | Operational Capability Development |