O Square icon

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24"><g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5"><path d="M21 3.6v16.8a.6.6 0 0 1-.6.6H3.6a.6.6 0 0 1-.6-.6V3.6a.6.6 0 0 1 .6-.6h16.8a.6.6 0 0 1 .6.6Z"/><path d="M12.2 8h-.4A1.8 1.8 0 0 0 10 9.8v4.4a1.8 1.8 0 0 0 1.8 1.8h.4a1.8 1.8 0 0 0 1.8-1.8V9.8A1.8 1.8 0 0 0 12.2 8Z"/></g></svg>