飛行の三鈷[higyounosanko] three-pronged vajra flung by Kukai on his return from China to determine the Holy Land of Esoteric Buddism
三鈷[sanko] trident vajra
独鈷[tokko] tokko

独鈷石[tokkoishi] ground stone tool from the late Jomon period (named after its similarity to the Buddhist tokko)
雷鈷[raiko] ground stone tool from the late Jomon period