acrn-hypervisor/doc/developer-guides/images/circle-square.dot

digraph {
   bgcolor="transparent"; rankdir=LR;
   { a [shape=circle height="1" style=filled color=AntiqueWhite
        label="Circle\nLabel"]
     b [shape=box height="1" width="1" style="rounded,filled"
        color="#F080F0" label="Square\nLabel"]
   }
   a -> b
}