| Subject | English | German |
| gen. | engine rotor | Triebwerksrotor (Gasturbine) |
| engin. | four-rotor engine | Vierfachmotor |
| engin. | four-rotor engine | Vierscheibenmotor (Wankelmotor) |
| engin. | single-rotor engine | Einscheibenmotor (Wankelmotor) |
| engin. | three-rotor engine | Dreischeibenmotor (Wankelmotor) |
| engin. | twin-rotor engine | Zweischeibenmotor (Wankelmotor) |
| engin. | two-rotor engine | Zweifachmotor (Wankelmotor) |