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A blank circle, which is usually either empty (meaning unselected option) or containing a smaller, large solid black circle (meaning selected option).

A radio that uses pop-out buttons.

Designed after the physical buttons used on older radios to select preset stations – when one of the buttons was pressed, other buttons would pop out, leaving the pressed button the only button in the "pushed in" position.

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1. (graphical user interface, usually found on the Internet) The radio button, which usually comes in groups (sets of multiple radio buttons), each one corresponding to an exclusive option, from which only one may be chosen. When a radio button is pressed, any previously selected radio button is automatically un-selected.

• radio button on Wikipedia.Wikipedia