| Acronym | Meaning |
| CS | Control Segment |
| OISSP | Office Of Interim Space Station Program |
| MPTA | Main Propulsion Test Article |
| TK | Tank |
| ESTEC | European Space Research And Technology Center |
| OTK | Oxidizer Tank |
| IV | Intravehicular |
| COBE | Cosmic Background Explorer |
| GSI | Government Source Inspection |
| OPR | Office Of Primary Responsibility |