| Zwanzigersystem | vigesimal system |
| Zweiersystem | binary numeral system |
| zwanzigste | twentieth |
| Zehnersystem | decimal |
| Zwanziger | twenties |
| zwanziger Jahre | twenties |
| zwanzigstens | twentiethly |
| Untersystem | sub-system |
| Abwassersystem | sewage system sewerage wastewater system |
| Planetensystem | planetary system |
| Waffensystem | weapon systems |
| Zahlensystem | number system |
| Zwangsverwalter | sequester |
| Zwanzigcentstück | twenty-cent piece |
| Sechsersystem | senary |
| Binärsystem | binary system |
| Dateisystem | file system |
| Notensystem | stave |
| Sedezimalsystem | hexadecimal |
| Wahlsystem | voting system |