| Acronym | Meaning |
| SST | Spectroscopic Survey Telescope / SuperSonic Transport |
| IGM | InterGalactic Medium |
| MSU | Microwave Sounding Unit |
| APT | Automatic Picture Transmission |
| ZHR | Zenith Hourly Rate |
| SEPAC | Space Experiments With Particle Accelerators |
| MCC | Mission Control Center |
| VISSR | Visible/Infrared Spin-Scan Radiometer |
| SNU | Solar Neutrino Units |
| SNR | Signal To Noise Ratio / SuperNova Remnant |