| Acronym | Meaning |
| MACS | Modular Attitude Control System |
| TDT | Terrestrial Dynamic Time |
| PSF | Point Spread Function |
| GUGK | Glavnoye Upravileniye Geodesii I Kartografii |
| AGE | Auxiliary Ground Equipment |
| WUPPE | Wisconsin Ultraviolet PhotoPolarimter Experiment |
| EUV | Extreme UltraViolet |
| POP | PO Polyot |
| TCS | Thermal Control System |
| CFRP | Carbon Fibre Reinforced Plastic |