This talks about the obvious ones: the Yggdrasil, Mjolnir and Valknut. There was a rumour earlier on that there was a Sonnenrad on his left shoulder, but that was based on early photos where his cosplay was in the way.
With a better photo:
It doesn’t look like there is a Sonnenrad there. There is a greek key, which might be a reference to the Greek Neo-Nazi Golden Dawn party
Or it might just be pretty. We can’t be sure he’s educated enough to know who they are.
I suspect the “coded 88” is a reference to the ring of blobby blobs around the meandros, which might be subtle "8"s repeated, or might just be blobby blobs.
