Bus is a term which can refer to:
1. A vehicle designed to carry passengers.
Usually thought of as large, such as a tour bus or school bus. But 15 passenger vans are often licensed as busses.
2. Conductor or a group of conductors which serve as a common connection for multiple circuits.
3. Bus (underground) are metal bars used to conduct current from a primary to the customer service in an underground vault.
List of books: Bus