| Subject | English | German |
| punch.card. | master card operation | Arbeitsgang mit Hauptkarte |
| tech. | master operation card | Arbeitsgang-Hauptkarte |
| el. | master/slave operation | Master-Slave-Betrieb |
| comp., MS | operations master | Betriebsmaster (A domain controller that has been assigned one or more special roles in an Active Directory domain) |