A pin-back button or pinback button, pin button, button badge, or simply pin-back or badge, is a button or badge that can be temporarily fastened to ...
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the surface of a garment using a safety pin, or a pin formed from wire, a clutch or other mechanism. This fastening mechanism is anchored to the back side of a button-shaped metal disk, either flat or concave, which leaves an area on the front of the button to carry an image or printed message. The word is commonly associated with a campaign button used during a political campaign. The first design for a pin-back button in the United States was patented in 1896, and contemporary buttons have many of the same design features.
