| Planetensystem | planetary system |
| Notensystem | stave |
| Glaubenssystem | belief system |
| Nervensystem | nervous system |
| Periodensystem | periodic table |
| Sonnensystem | solar system Solar System |
| Waffensystem | weapon systems |
| Zahlensystem | number system |
| Dateisystem | file system |
| Untersystem | sub-system |
| Larsen-System | Larsen's Opening Queen's Fianchetto Opening |
| Planetenring | planetary ring |
| Planetesimal | planetesimal |
| Plattensee | Balaton |
| Zeichensystem | sign system |
| Sternsystem | star system |
| Tonsystem | pitch space |
| Zehnersystem | decimal |
| Leitsystem | distributed control system |
| Managementsystem | management system |