Horizontal molding on a furniture leg. The term collar refers to a decorative element or a protective covering that is often placed on the top or bottom of a furniture leg. It is typically made of wood or metal and is used to enhance the aesthetic appeal of the furniture piece. The collar can be found in various shapes and designs, such as cylindrical or flared, and may have elaborate carvings or other decorative features. Additionally, collars can also serve a functional purpose by providing structural support or preventing wear and tear on the furniture legs.