The
biretta is a square
cap with three or four peaks or horns, sometimes surmounted by a tuft. Traditionally the three peaked biretta is worn by
Roman Catholic clergy and some
Anglican and
Lutheran clergy. The four peaked biretta is worn as academic dress by those holding a doctoral degree from a pontifical faculty or
pontifical university. Occasionally the biretta is worn by advocates in law courts, for instance the
advocates in the
Channel Islands.