| Acronym | Meaning |
| LPS | Liters Per Second |
| DU | Display Unit |
| EPWG | Environmental Projects Working Group |
| PVA | Propellant Valve Actuator |
| RPA | Record And Playback Assembly |
| NFPA | NNFPANational Fire Protection Association |
| DN | Down |
| L&T | Laboratory And Test |
| PCN | Program Control Number |
| PDM/FM | Pulse Duration Modulation/Frequency Modulation |