Lit. "three-prong pounder motif." Also called *kongōsho 金剛杵 (vajra pounder, diamond for its hardness). A motif found on broad concave eave end tiles *nokihiragawara 軒平瓦. It is derived from a three-pronged weapon originally used for self defense in India. Buddhist priests belonging to Esoteric Buddhism mikkyō 密教 came to use it as a symbol that represented the conquering of earthly desires and human vice to achieve salvation. There are also single *tokkosho 独鈷杵 and five pronged *gokosho 五鈷杵 implements of this type. One unearthed at Rokuharamitsuji 六波羅密寺 in Kyoto, has a one-prong design and is called konbeimon sumigi futagawara 金べい文隅木蓋瓦 (thunderbolt motif on the cover tile of a hip rafter). In all cases, the implement motif is surrounded by a high plain border. Tiles with sankoshomon have also been unearthed at Iwashimizu Hachimangū 石清水八幡宮 in Kyoto .