The term 'ROTARY TELEPHONE PART' can be summarized as the DIAL, which is a four-letter word. The DIAL is a component of a rotary telephone, which is an older type of telephone that uses a rotary DIAL to make calls. The DIAL is a circular disc with numbers and letters on it, which is used to select the number to be called. When the user turns the DIAL, it causes the telephone to make a series of clicks, which are then translated into the number being dialed.