cocked hat

Short definition from Wiktionary

Noun

1. 1
   A hat with the brim turned up to form two or three points; a bicorn or tricorn
2. 2
   The triangular space formed by the intersection of the position lines on a chart determined by plotting three bearings; the approximate position of the ship
3. 3
   A game similar to ninepins, except that only three pins, arranged in a triangle, are used.