bell ringer

noun4

1. •
   A person, especially one of a group, who rings bells.
2. •
   An assignment, done regularly at the beginning of a class, and intended as a warm-up before other classroom activities.
3. •
   (disapproving) A door-to-door salesman.
4. •
   A type of anatomy exam in which students must answer questions at a series of stations and move on to the next station when a bell is rung.