Single article is a term used to describe a single ITEM or unit of merchandise. It is often used in retail stores to refer to a single ITEM that is sold, such as a shirt, a pair of shoes, or a toy. Single article can also be used to refer to a single ITEM that is part of a larger set, such as a single book in a series of books. In the context of a crossword puzzle, the term single article would refer to a single word or phrase that is used to complete the puzzle.