Roman Catholic Church. a head-piece consisting of three coronets on top of which is an orb and a cross, worn by the pope, or carried before him during certain nonliturgical functions.
3.
the position, authority, and dignity of the pope.
4.
a high headdress, or turban, worn by the ancient Persians and others.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
1555, "headdress of the Persian kings" (also worn by men of rank), from L. tiara, from Gk. tiara, of unknown origin. Earlier in Anglicized form tiar (1513).