California State Building Code - Restrooms
Doorways leading to men's restroom facilities shall be identified by an equivalent triangle 1.4 inch thick with edges 12 inches long and a vertex pointing upward. Women's restroom facilities shall be identified by a circle 1/4 inch thick, 12 inches in diameter. Restroom (unisex) facilities shall be identified by a circle 1/4 inch thick, 12 inches in diameter with a 1/4 inch thick triangle superimposed on the circle and within the 12 inch diameter. These geometric symbols shall be centered on the door at a height of 60 inches and their color and the contrast shall be distinctly different from the color and the contrast of the door.