square-lock
#square
#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="M5 3.5C4.17157 3.5 3.5 4.17157 3.5 5V19C3.5 19.8284 4.17157 20.5 5 20.5H19C19.8284 20.5 20.5 19.8284 20.5 19V5C20.5 4.17157 19.8284 3.5 19 3.5H5ZM12 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="M5 3.5C4.17157 3.5 3.5 4.17157 3.5 5V19C3.5 19.8284 4.17157 20.5 5 20.5H19C19.8284 20.5 20.5 19.8284 20.5 19V5C20.5 4.17157 19.8284 3.5 19 3.5H5ZM12 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>