| Acronym | Meaning |
| MILLS | Modular Integrated Utility Systems |
| ESA | European Space Agency |
| CCBD | Configuration Control Board Directive |
| GAC | Ground Attitude Control |
| ESB | Essential Switching Box |
| EPPS | Electrical Power/Pyro Sequential System |
| IARS | Independent Air Revitalization System |
| OD | Operational Downlink/Downlist |
| KCAL | Kilocalorie |
| ECLS | Environmental Control And Life Support |