为什么单选按钮在英文中是叫「Radio Button」

维基百科:Radio buttons were named after the physical buttons used on older car 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.
就是说因为汽车收音机上的按钮是按下一个，其他的就会弹起来。所以这种按钮就叫 Radio Button 了。
还有一个配图：