As the name suggests, it is about the angle at which the transmission works. In coaxial gears, the entrance and output are on one axis, so there is no change in the direction of movement (angle = 0 °). However, in angular gears, the change is usually 90 °. Depending on the design of the angular gear or angular planetary gear, the axle shift may occur, especially in the case of integration with the servo engine or other compact drive systems. This configuration is often selected in applications where the space is limited or a specific setting of elements is required.