also: にっけい
noun
ushnisha; cranial protuberance on a Buddha
Buddhist term referring to the fleshy protrusion on the crown of a Buddha's head, symbolizing supreme wisdom.
仏像の頭頂にある肉髻は、悟りの象徴とされる。
The ushnisha on the top of a Buddha statue's head is considered a symbol of enlightenment.
From Chinese 肉髻 (ròujì), a translation of Sanskrit uṣṇīṣa. The exact derivation is uncertain; the spelling is conventionally associated with the Buddhist concept.