People Are Just Beginning to Understand What the Restroom Sign Means

A TikToker explained: “Before indoor plumbing, we actually had a room for the bathtub… Indoor plumbing is coming, and there’s already a room with a bathtub… So where do you put the toilet? Just put it in a closet.”
Now, “water closet” refers to a room with a toilet but no bathtub, as Plumb World confirms: “Water closet has been used instead of bathroom to describe a room with a toilet but no bathtub.”