The nautical term for a toilet is a “head.” This designation originates from the historical placement of toilet facilities on sailing vessels. Specifically, these areas were typically located at the bow, or the foremost part, of the ship.
The location at the bow offered a practical solution for waste disposal. The movement of the ship through the water aided in flushing waste away, contributing to sanitation. Moreover, the prevailing winds at the front of the vessel helped to minimize odors affecting the rest of the crew. Over time, the term referring to the forward part of the ship became synonymous with the sanitary facilities themselves.