system-uicons/src/images/icons/grid_circles_add.svg

<svg height="21" viewBox="0 0 21 21" width="21" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"><circle cx="13.5" cy="7.5" r="2"/><circle cx="7.5" cy="7.5" r="2"/><circle cx="7.5" cy="13.5" r="2"/><path d="m13.5 11.5v4"/><path d="m15.5 13.5h-4"/></g></svg>