godot/scene/theme/icons/radio_checked_disabled.svg

<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><circle cx="8" cy="8" r="7" fill="#fff" fill-opacity=".37"/><circle cx="8" cy="8" r="4" fill="#1a1a1a" fill-opacity=".5"/></svg>