In the three-ball carom game, a small space at each corner of the table.
The open counter (negative space) formed by two downward strokes that meet at an internal acute angle, potentially above a vertex, as in the letters "V" and "Y".
Verb
To provide with a crotch; to give the form of a crotch to.
To notch (a log) on opposite sides to provide a grip for the dogs that will haul it.