2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)

11B-703.7.2.6.1 Men’s toilet and bathing facilities.

An equilateral triangle, ¼ inch (6.4 mm) thick with edges 12 inches (305 mm) long and a vertex pointing upward, shall be located at entrances to men’s toilet and bathing facilities. The triangle symbol shall contrast with the door, either light on a dark background or dark on a light background.

Exception: Within secure perimeter of detention and correctional facilities, geometric symbols shall not be required to be ¼ inch (6.4 mm) thick.