A Six is the small group organization within a Pack for Cubs. It usually contains 6 youth - hence the name.
The youth responsible for the six is called a "Sixer", with the second in charge called a "Second". (It is a common mistake to call that Cub Scout a "Seconder".)
Each six is identified by a colour, with each Cub Scout having a coloured triangle called a "Six Patch" sewn to the uniform sleeve. These are available from the Scout Shop in Black, Blue, Brown, Green, Grey, Red, Tawny, White, and Yellow.
CHANGING! Under the Canadian Path program revitalization, smaller groups are called Lairs. Leadership is shared among the third year Cubs, called Howlers. Assistant leadership with Colony can be done with second years Cubs, called Trackers.