Answer:
The abbreviation "WC" stands for "Water Closet" a term that first appeared in the mid- 19th century. The "closet" portion of the name referred to a small, enclosed space-quite literally a closet-where the toilet was placed. At the time, homes already had dedicated rooms for bathing (bathrooms), so the new technology of indoor toilets was installed in these small, private spaces. This setup was revolutionary during an era when outdoor toilets were still common.