The term 'slow-moving vessel' can be summarized as an ARK, which is a three-letter word. An ARK is a large boat or ship that is used to transport people and goods over water. It is typically slow-moving due to its size and the fact that it is not powered by an engine. Historically, arks were used for religious purposes, such as Noah's ARK in the Bible, but they are also used today for recreational activities, such as fishing and sightseeing.