| Acronym | Meaning |
 | OTHB | Over The Horizon Backscatter |
| MOTV | Manned Orbital Transfer Vehicle |
| ELDO | European Launcher Development Organisation |
| DAC | Delayed Action Command |
| CASCA | Canadian Astronomical Society |
| OAO | Orbiting Astronomical Observatory |
| CIRRIS | Cryogenic InfraRed Radiance Instrument For Shuttle |
| MIMR | Multifrequency Imaging Microwave Radiometer |
| MSS | Multispectral Scanner |
| OCTW | Optical Communications Through The Shuttle Window |
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