How many times have you seen the letters “WC” on a bathroom door — without ever stopping to ask what they mean?

For decades, travelers, tourists, and locals alike have followed those two letters without question. Some guessed it meant “wash closet,” others thought it stood for “water control.” But the truth has left many both amused and amazed.

As one viral TikTok explained, “WC” actually stands for “water closet.” The name dates back to the early 1900s when indoor plumbing first became common. At the time, most homes didn’t have dedicated bathrooms, so people simply installed toilets in small converted closets — the only places with running water. And so, the water closet was born.

Before plumbing, a “bathroom” literally meant a room for bathing, often with no toilet at all. The two rooms were separate — and the name WC stuck for the space that held just the toilet.

Now, as people online react, one person joked, “Can’t believe I’ve been using it my whole life without knowing!” Another added, “Well, that explains everything — and somehow makes it sound fancier!”

So next time you see “WC” on a sign, you’ll know — it’s not just an abbreviation. It’s a small reminder of how far we’ve come from buckets and outhouses to the comfort of modern life.