| Acronym | Meaning |
 | POP | PO Polyot |
| DIRBE | Diffuse Infrared Background Experiment |
| TIROS | Television InfraRed Observation Satellite |
| TOS | Transfer Orbit Stage |
| ATCS | Active Thermal Control System |
| USA/RC | Universities Space Automation/Robotics Consortium |
| GOES | Geostationary Orbiting Environmental Satellite |
| MOL | Manned Orbiting Laboratory |
| SNU | Solar Neutrino Units |
| DDCU | DC-to-DC Converter Unit |
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