I assume that it is to power the on board Linux OrSOC device?
It looks like a Beaglebone. Further, the cut-out to the left looks as though it might be for a rPi.
You could be right, here's a comparison:
Also note the round edges.
Which makes me wonder - are we going to also need a separate 5v power supply adaptor? Or is there such an adaptor that can convert one of the connectors from a PSU to that fitting?