The term 'Rotating Engine Part' can be summarized as a CAM, which is a three-letter word. A CAM is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion or vice versa. It is commonly used in internal combustion engines and other machinery to convert rotational motion into linear motion. Cams are also used in many other applications such as robotics, pumps, and valves.