The term 'rotating tooth' can be summarized as a COG, which is a three-letter word. A COG is a wheel with teeth around its edge that is used to transmit motion from one part of a machine to another. It is usually made of metal and is used in a variety of machines, such as clocks, bicycles, and automobiles. Cogs are also used in some types of machinery to create rotational force, which is why they are often referred to as 'rotating teeth'.