| Acronym | Meaning |
| HFDS | Hydrogen Fluid Distribution System |
| IPS | Isc Initial Software Configuration Map |
| FAA | Federal Aviation Agency |
| SEC | Source Evaluation Committee |
| ISPM | International Solar Polar Mission |
| FI | FlightInstrumentation |
| LVLH | Local Vertical/Local Horizontal |
| SOW | Square Wave |
| PCI | Peripheral Controller Interface |
| DCM | Direction Cosine Matrix |