Barnstar

A barnstar (or barn star, primitive star, or Pennsylvania star) is a decorative painted object or image, often in the shape of a five-pointed star but occasionally in a circular "wagon wheel" style, used to adorn a barn in some parts of the United States. They have no structural purpose, but may be considered lucky, akin to a horseshoe mounted over a doorway. They are especially common in Pennsylvania and frequently seen in German-American farming communities.