| Acronym | Meaning |
 | GEM | Giotto Extended Mission |
| OTHB | Over The Horizon Backscatter |
| SLAP | Space Link Access Protocol |
| SLS | Space(lab) Life Sciences |
| APJ | Astrophysical Journal |
| FPD | Flight Projects Directorate |
| TSPK | Tsentr Podgotovka Kosmonavti |
| HRDI | High Resolution Doppler Imager |
| SEP | Societe Europeenne De Propulsion |
| GRU | Glavnoye Razvedivatel'noye Upravileniye |
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