Whenever I’m at a public place and am using the men’s room for the first time, I have no idea if I’m about to walk into a single-use bathroom or a multi-use bathroom. It’s not a huge deal, but it always gives me a moment’s stress to think I might be walking in on somebody who forgot to lock the door from the inside.
The bathroom signs are great at informing us which door is for women and which door is for men, but they make no effort to tell us if the bathroom is single-use or not. Here’s what popped into my head the other day:

Simple.
