| Acronym | Meaning |
| SF | Safe |
| CAD | Computer Aided Design |
| TSGP | Test Sequence Generator Program (ESTEC) |
| MBFP | Manufacturing Build And Flow Plan |
| W/WMS | Water/Waste Management System (Subsystem) |
| TARC | Through Axis Rotational Control |
| IUS | Inertial UPper Stage (was Interim UPper Stage) |
| RBN | Radio Beacon |
| DPA | Data Processing Assembly |
| ODU | Output Display Unit |