| Acronym | Meaning |
| RC | Recurring Cost |
| EMPGS | Electrical/Mechanical Power Generation SubsYstem |
| CU | Control Unit |
| OMRB | Operating Material Review Board |
| MEP | Main Engine Propellant |
| OCF | Onboard Computational Facility |
| HPFTP | High Pressure Fuel Turbopump |
| ESE | Electrical Support Equipment |
| EPROM | Erasable Programmable Read Only Memory |
| FRP | Fuselage Reference Plane |