horn
Something projecting, usually of small size, and tapering more or less toward a point. One of the four angles of a Corinthian abacus is in this sense a horn; and the term may be applied to one of the strong-stemmed projections terminating in leaf form which were characteristic of 13th century Gothic sculpture. (French crochet.) 2. A volute like that of an Ionic capital, for which the more extended term ram’s horn would seem to be more appropriate. 3. One of the corners of the Mensa of an altar. 4. That part of a jamb extending above the head of a door or window frame, or the horizontal extension of a windowsill beyond the jamb. (Sturgis, 1900)