Within avionic systems, the artificial horizon may well be the single-most critical element in instrument flight control, creating the reference for the attitude of the aircraft. Gyros can also be used to sense changes in pitch, roll, and yaw, the angular rotations of aircraft in x, y, and z axes. As well, the attitude heading reference system is an integrated system that provides heading, attitude and yaw information, replacing traditional mechanical gyroscopic flight instruments. Each of these is an integral element in flight control systems. Applications for these devices include commercial aircraft as well as unmanned aerial vehicles, commonly referred to as UAVs or drones.