This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A hat having the brim turned up on three sides.

adj. Having three corners, horns, or projections.

n. A three-sided hat with the brim turned up

n. A three-horned fractal

adj. Having three horns or similar projections

Having three horns or horn-like processes.

n. A hat with three points or horns; a cocked hat having the brim folded upward against the crown on three sides, producing three angles; hence, by popular misapplication, the hat worn by the French gendarmes, which has only two points: usually written as French, tricorne. See cut 13 under hat.

n. cocked hat with the brim turned up to form three points

"The rally intends to call “the GOP back to its roots,” if by “roots,” you mean lots of people in tricorn hats, whose idea of a good time is batting around their favorite economists from the Austrian School."

cocked hat   

bicorn    unicorn    bicorne   

narrow-brimmed    black-lace    cocked-up    shovel-shaped    beaver skin    russian-style    crêpe    white-plumed    timefor    four-quart