Flying Thunder God Kunai (飛雷神クナイ, Hiraishin Kunai) are custom-made kunai (特注クナイ, tokuchū kunai) and signature tool of Minato Namikaze, who uses it in conjunction with his Space–Time Ninjutsu: the Flying Thunder God Technique. They differ from a standard kunai in that they have three blades instead of one and on the handle (which is thicker than normal) is the "marker" for Minato's teleportation ability.