A History of California Restroom Signs
CASI: Certified Access Specialist Institute
An extremely useful article that you can find at, http://www.casinstitute.org/content/solving-mysteries-california-restroom-sign.
A twelve inch diameter circle identified a girls’ or women’s restroom, and a twelve inch equilateral triangle identified a boys’ or men’s restroom. A triangle placed on a circle was used to identify a single user restroom available to either sex. An important consideration was that the color of the shapes had to contrast with the door on which they were placed.
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