The term 'Individual Article or Unit' is used to describe a single ITEM, usually a product, that can be sold or purchased. This term is often used in the retail industry to refer to a single unit of a product, such as a shirt or a pair of shoes. It is also used in the manufacturing industry to refer to a single component of a larger product, such as a part of a car or a piece of furniture. The four-letter word for this term is 'ITEM'.