| Acronym | Meaning |
 | PCG | Protein Crystal Growth Experiment |
| PPM | Positions And Proper Motions (catalog) |
| GCVS | General Catalog Of Variable Stars |
| SAS | Space Activity Suit / Space Adaptation Syndrome |
| GRU | Glavnoye Razvedivatel'noye Upravileniye |
| VLF | Very Low Frequency |
| CNO | Carbon-Nitrogen-Oxygen |
| GR | General Relativity |
| SDSS | Sloan Digital Sky Survey |
| ALEXIS | Array Of Low Energy X-ray Imaging Sensors |
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