circle-lock
#circle
#lock
#keyhole
#shut
#block
#lock up
#close
#fix
JSON.parse(atob('W10='))
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
<path fill-rule="evenodd" clip-rule="evenodd" d="M12 3.5C16.6944 3.5 20.5 7.30558 20.5 12C20.5 16.6944 16.6944 20.5 12 20.5C7.30558 20.5 3.5 16.6944 3.5 12C3.5 7.30558 7.30558 3.5 12 3.5ZM12 8C13.1046 8 14 8.89543 14 10C14 10.7403 13.5978 11.3866 13 11.7324V15C13 15.5523 12.5523 16 12 16C11.4477 16 11 15.5523 11 15V11.7324C10.4022 11.3866 10 10.7403 10 10C10 8.89543 10.8954 8 12 8Z" fill="black"/>
</svg>
JSON.parse(atob('W10='))
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
<path fill-rule="evenodd" clip-rule="evenodd" d="M12 3.5C16.6944 3.5 20.5 7.30558 20.5 12C20.5 16.6944 16.6944 20.5 12 20.5C7.30558 20.5 3.5 16.6944 3.5 12C3.5 7.30558 7.30558 3.5 12 3.5ZM12 8C13.1046 8 14 8.89543 14 10C14 10.7403 13.5978 11.3866 13 11.7324V15C13 15.5523 12.5523 16 12 16C11.4477 16 11 15.5523 11 15V11.7324C10.4022 11.3866 10 10.7403 10 10C10 8.89543 10.8954 8 12 8Z" fill="black"/>
</svg>