The term CUB SCOUT UNIT is composed of three parts: DEN (3 letters), PACK (4 letters). A Cub Scout Unit is a group of Cub Scouts, which is part of the Boy Scouts of America organization. The DEN is the smallest unit of the Cub Scouts and is typically made up of 6-8 boys or girls in the same grade level. The PACK is the larger unit, which is made up of several Dens and is typically led by a volunteer adult leader.