• A knob, disk, or the like, which is pressed to activate or operate a circuit, device, component, machine, and so on. For instance, a button may be pressed to activate an electric circuit. A button may also be virtual, as seen when a computer mouse presses such a button on-screen by clicking the mouse. Also called pushbutton.
  • A small piece of metal alloyed to a semiconductor wafer to form a junction. Also called dot (3).
  • In a carbon microphone, a container that holds carbon granules. Also called carbon button, or microphone button.
  • On a computer mouse, a surface which is pressed, or clicked, to select objects, perform functions, or the like. Also called mouse button.

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