Nail (fastener)

Sharp object of hard metal used as a fastener

In woodworking and construction, a nail is a small object made of metal (or wood, called a tree nail or "trunnel") which is used as a fastener, as a peg to hang something, or sometimes as a decoration. Usually, nails have a sharp point on one end and a flattened head on the other, but headless nails are available. Nails are made in a great variety of forms for specialized purposes.

From Wikipedia, under CC BY-SA. More on occurri.