IUID? No, wait, that's QR isn't it? IUID is data matrix, so no round edges, right? Eh - I should ask Marie... She used to deal with this all the time when she was running that laser engraver a few years ago.
Interesting though - regardless of what format it's in my phone refuses to scan it... Won't even lock on for some reason. Could the color be throwing it off?
But even so, it's probably a little too obscure for a shirt logo, don't you think?
Adam