| Subject | English | German |
| phys. | linear momentum operator | Impulsoperator |
| opt. | linear operator | linearer Übertrager. (transmitting a sinusoidal distribution of intensity in space as a sinusoidal distribution without distortion) |
| tech. | linear operator | linearer Operator |
| IT | non-linear operator | nichtlinearer Operator |
| tech. | rank of a linear operator | Rang eines linearen Operators |