What is a troop in boys scout's terminology?

The Boy Scout Troop, Cub Scout Pack, Venturing Crew, and Sea Scout Boat are the main units of organization of the BSA. They are often subdivided into smaller groups of youths (patrols and dens etc.) but those smaller units do not have their own governing bodies.

The Troop is sponsored by an organization with an interest in youth such as a church, school, or civic goup (such as Knights of Columbus, American Legion, Elks Club and others). The sponsor appoints adults to leadership roles such as Scoutmaster and committee chair. It is governed by a Troop committe. The number of Scouts in the Troop varies from just a few to upwards of 50-100 with about 20 being a fairly typical number.