+A [Fastener](/wiki/fastener), often a small disc, a button elegantly secures fabric, such as on a [Shirt](/wiki/shirt). It also signifies a simple push-mechanism, a fundamental control point to activate a function or system.
+## See also
+- [Zipper](/wiki/zipper)
+- [Switch](/wiki/switch)
+- [User Interface](/wiki/user_interface)
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