金剛

an adamant (mythical rock thought to be of impenetrable hardness)

(by extension) something extremely solid and indestructible

(by extension) the firmness of one's own spirit and the strength of one's own spiritual power

Short for 金剛石 (kongōseki): a diamond as a mineral or gemstone

(Buddhism) Short for 金剛界 (kongōkai): the Diamond Realm in Vajrayana Buddhism

(Buddhism) Short for 金剛杵 (kongōsho): a vajra (Buddhist double-headed ceremonial mace)

(Buddhism) Short for 金剛力士 (kongō rikishi): a pair of vajra-wielding deities guarding most Buddhist temples

(Buddhism) Short for 金剛童子 (kongō dōshi):

Short for 金剛草履 (kongō zōri): a large zori made from straw or soft rush

(by extension, theater) an actor or prostitute in charge of footwear, mostly handling kongō zōri