A thin, straight (usually cylindrical), pointed and headed object, usually of metal, that is used to fasten garments or various articles, or sometimes worn ornamentally.Pins have been made of gold, silver, brass, iron, or other materials. Often the head has been decorated with enamelling, engraving or gemstones. A similar pointed fastener at the back of a brooch orfibula and by which the piece is attached to a garment by being pierced twice through the fabric and secured by a cathc-plate. A pointed fastener (called an acus) that is formed by a complete and a180-degree turn, producing a spring at one end and having at the other end a catch-plate and a guard to cover the point.