Grounding Simucube Board

Hi all,
I’ve got a simple Question:
My Simucube + Mige works well from the beginning. While installing the board and PSU into a smaller housing I noticed these “Grounding”-Symbols beside the attachment holes. Do the need to have contact to the PSU? What are they meant for?!
Thanks in advance!

Those are just indicators, that the hole surrounds are grounded. There is no need to connect anything to them.

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