Urna: the soft white wisp of hair on the Buddhas brow. Considered one of the 32 signs of his enlightenment. Also represented by the dot between the eyes on images of the Buddha.
References
editThe lost Buddhas : Chinese Buddhist sculpture from Qingzhou Capon, Edmund, Liu, Yang, Nickel, Lukas. Sydney. NSW : Art Gallery of New South Wales, 2008.p136.