The term 'neutral or reverse' is often used in the context of a GEAR. A GEAR is a mechanical device that is used to transmit rotational motion and torque from one part to another. It is usually composed of two or more interlocking parts, which are connected by teeth that mesh together. In a neutral or reverse GEAR, the teeth of the gears are arranged in such a way that they do not move when the GEAR is engaged. This allows the vehicle to remain stationary or to move in reverse.