The term British Island can refer to two different crossword solutions: AIT, which is a three-letter acronym for an artificial island, and ISLE, which is a four-letter word for any island. An artificial island is a man-made structure that is built on top of an existing body of water, such as a lake or ocean. An ISLE is a small island, usually located in a body of water. Both terms are commonly used to describe islands that are part of the United Kingdom.