a small metal or plastic fastener a flat, circular head a sharp point at the bottom a colored head to distinguish it from other fasteners a short, thin shank between the head and point
thumbtack which is a small metal or plastic fastener thumbtack which is a flat, circular head thumbtack which is a sharp point at the bottom thumbtack which is a colored head to distinguish it from other fasteners thumbtack which is a short, thin shank between the head and point