iirc, radio buttons were an early form of bookmark in that one would rotate the tuner whose position was annotated by a scale marker, and when the radio was tuned as desired, one would pull the radio button, then push it in to set that button to that tuning. I have a memory of the tactile sensation in my fingers.
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That’s precisely the metaphor. A radio as in the radio station presets in your car.
iirc, radio buttons were an early form of bookmark in that one would rotate the tuner whose position was annotated by a scale marker, and when the radio was tuned as desired, one would pull the radio button, then push it in to set that button to that tuning. I have a memory of the tactile sensation in my fingers.