A clothespin or clothes peg is a fastener used to hang up clothes for drying, usually on a clothes line. Clothespins come in many different designs.
Plastic clothespins on a clothesline
Laundry pegged onto a clothes line
Hand-made one-piece wooden clothespins
A one-piece, mass-produced wooden clothespin (also known as a 'dolly peg')
A fastener or fastening is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. Steel fasteners are usually made of stainless steel, carbon steel, or alloy steel.
Typical fasteners (US quarter shown for scale)
Structural bolt DIN 6914 with DIN 6916 washer and UNI 5587 nut