Focsle, also spelled as fo'c'sle, forecastle, or forecastle, is a nautical term used to refer to the forward part of a ship, usually below the main deck. It is commonly used to house the crew's mess and sleeping quarters. Synonyms for Focsle include foredeck, forecastle deck, bowsprit, stemhead, and bow. In addition, the term may be used to refer to the upper deck on a fishing vessel or as a shortened version of the phrase "forecastle winch." The Focsle has an important role in a ship's construction as it helps to maintain balance and stability during sailing.