Nothing critical of a technical nature.
Might have been marked by wheel installer to reference while tightening lug nuts.
Or to act as a starting point when counting lugs.
Or to act as an ending point when counting lugs.
Or as a strobing mark if somehow the hub was being rotated and someone using a stroboscope was confirming the rotational speed.
I’ve got more of you need them
But the reality is - they mean nothing.