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Resembling weapons wielded by deities described in the Vedas, ancient Indian religious scriptures, the vajra pestle (kongōsho) has long been used in Esoteric Buddhist rituals. The word vajra means diamond and thunderbolt in Sanskrit. Vajras are thus indestructible and powerful tools of Buddhism. The number of prongs has significance, with single-, three-, and five-pronged vajras being used for different purposes. The stylized thunderbolt known as a vajra also connotes the speed of lightning and the indestructible qualities of diamond to best describe the attributes of Tantra. Vajras are ubiquitous in tantric art and ritual practices. This example from the Heian period (784-1185) reveals the early spread of Tantra from India across China and Southeast Asia to enter Japan where it is known as Shingon. A Japanese monk named Kūkai founded the Shingon sect of Esoteric Buddhism after he received the texts and teachings from a Chinese tantric master. When he returned to Japan in 806, he founded the influential Shingon sect.