Tantō

A tantō is simply a Japanese double edged knife or dagger. Several chūnin have carried tantō on the rear of the waist, although it is rarely used. The version Root uses are double-edged and have no tip, meant only for cutting. They carry the tantō vertically on the back, behind the shoulder. Sakumo Hatake and Kakashi Hatake in his childhood carried a special tantō, known as the White Light Chakra Sabre. Gamabunta also carries one, albeit a gigantic version.