| Acronym | Meaning |
| ISAMS | Improved Stratospheric And Mesospheric Sounder |
| JCMT | James Clerk Maxwell Telescope |
| HLC | Heavy Lift Capability |
| PPF | Columbus Polar Platform |
| LRSI | Low-temperature Reusable Surface Insulation |
| PN | Planetary Nebula |
| ENACEOS | ENAC For EOS |
| MISR | Multiangle Imaging Spectro-Radiometer |
| PLBD | Payload Bay Doors |
| NACA | National Advisory Committee On Aeronautics |