Washrooms, bathrooms, restrooms, and loos are just a few of the names used around the world for a facility dedicated to personal hygiene. The terminology varies by country and culture, reflecting language and social norms. In the United States, people typically say “bathroom” or “restroom,” while in the United Kingdom, “toilet,” “loo,” and “lavatory” are more common. Visitors may find this variety confusing when encountering unfamiliar signs.

One such term is “WC,” which stands for “water closet.” The phrase dates back to the 19th century, when indoor plumbing was still developing. At the time, it referred to a small, dedicated room containing a flushable toilet, separate from bathing areas.

Before modern plumbing, bathing and sanitation were often conducted in different spaces, sometimes requiring water to be carried manually. The water closet offered a compact, practical solution by isolating the toilet in its own room.