PINS

There are several distinct types of fastener, which may be referred to as a pin. These include small headless nails, sharpened pins used for holding fabrics while sewing, attaching paper to pin boards and the like, and several types of mechanical fasteners. 

Pins are an unthreaded mechanical fastener, which are designed to be inserted through preformed holes. 

Taper Pins

Dowel Pins

Hair Pins