godot/editor/icons/Groups.svg

<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#e0e0e0" d="M2 1a1 1 0 0 0-1 1v12a1 1 0 0 0 1 1h12a1 1 0 0 0 1-1V2a1 1 0 0 0-1-1zm1 2h10v10H3zm5 2a3 3 0 0 0 0 6 3 3 0 0 0 0-6z"/></svg>