Origin of HTML radio buttons

The radio buttons in HTML come in handy when the user should select only one option in a form.

The HTML looks like this:

<input type="radio" name="computer" value="mac"/> Mac
<input type="radio" name="computer" value="pc"/> PC
<input type="radio" name="computer" value="hackintosh"/> Hackintosh

This element was called radio buttons because of the behaviour of the old car radios, where you could keep pushed only one button at the same time.