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A tantō is simply a small katana. Several chūnin, medical-nin and shinobi of Konohagakure wear them strapped to their lower backs when going into battle.
The version Root uses are double-edged and have no tip, meant only for cutting and defense. They carry the tantō vertically on the back specifically behind the shoulder, Sai is one of the notable wielders of the tantō, which he carries on his back behind the right shoulder.
Giant toads like Gamabunta carry a gigantic version that fits their size.
There is a special tantō known as the White Light Chakra Sabre that emits a white streak of chakra when swung.