A radio piece is a type of audio production that is broadcasted on the radio. It can be a news report, a documentary, a drama, or any other type of audio production. The term 'radio piece' is often used to refer to the entire production, including the script, sound effects, and music. The word 'DIAL' is a four-letter word that refers to the tuning knob on a radio, which is used to adjust the frequency of the radio station being listened to.