Many people have seen the letters “WC” on public signs, hotel maps, or building floor plans without knowing what they stand for. WC is an abbreviation for “water closet,” a traditional term used to describe a room containing a flush toilet. Although the phrase sounds old-fashioned today, it remains widely recognized in many parts of Europe and continues to appear on restroom signs.

The term originated in 19th-century Britain, when indoor plumbing became more common. At the time, a “water closet” referred to a small room equipped with a flushing toilet, distinguishing it from earlier chamber pots and other non-flushing sanitation methods. As indoor plumbing spread, the abbreviation WC became a convenient way to identify toilet facilities in public buildings.

Today, WC is commonly found in airports, hotels, shopping centers, train stations, and other public places, especially across Europe. While most English speakers understand what it means, they rarely use the term in everyday conversation. Instead, people are more likely to say “toilet,” “restroom,” “bathroom,” or, particularly in the UK, “loo.”

Although the expression “water closet” is now considered somewhat formal or technical, the abbreviation WC remains an internationally recognized symbol for toilet facilities. Knowing what it stands for can make traveling easier, especially when navigating unfamiliar buildings or countries where restroom signs use WC instead of more familiar terms.