| Tunnelsystem | tunnel system |
| Sonnensystem | solar system Solar System |
| Untersystem | sub-system |
| Zehnersystem | decimal |
| Tonsystem | pitch space |
| Tennessee | Tennessee |
| Wahlsystem | voting system |
| Oktalsystem | octal numeral system |
| Schulsystem | school system |
| Atmungssystem | respiratory system |
| Dateisystem | file system |
| Justizsystem | judiciary |
| Notensystem | stave |
| Soundsystem | sound system |
| Typsystem | type system |
| Binärsystem | binary system |
| Nervensystem | nervous system |
| Sternsystem | star system |
| Subsystem | subsystem |
| Waffensystem | weapon systems |