What is the meaning of the furniture term Pigeonhole?

In furniture terminology, a pigeonhole refers to a small enclosed compartment or cubbyhole that is typically used for storing or organizing small items or documents. Pigeonholes are often found in desks, cabinets, or shelving units and are designed to provide separate compartments for different items, making it easier to categorize and access them. The term pigeonhole is derived from the small spaces that were traditionally used to house pigeons or doves, which were trained to deliver messages in the past. Small compartments in desks and cabinets for papers.