Everywhere you go — airports, train stations, shopping malls, cafes, or even small roadside restaurants — you’ll encounter one of the most universal signs in the world. Sometimes it’s a simple set of letters: “WC.” Other times, it’s a pair of stick figures, one in pants and one in a skirt. Whatever form they take, these signs all point to the same thing: a restroom. But have you ever stopped to wonder where these terms and symbols came from? Behind those three letters and those little icons lies a surprising story that spans centuries, cultures, and design. The Origins of…