| Acronym | Meaning |
 | APT | Automatic Photoelectric Telescope |
| PCT | Photometric Calibration Test |
| ERS | Environmental Research Satellite |
| SME | Solar Mesosphere Explorer |
| DMR | Differential Microwave Radiometer |
| ACR | Active Cavity Radiometer |
| BFCS | Backup Flight Control System |
| EOSP | Earth Observing Scanning Polarimeter |
| SST | Spectroscopic Survey Telescope / SuperSonic Transport |
| RIACS | Research Institute For Advanced Computer Science |
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