Except the # on his uniform should be 45ø19.
I don't get it. I'm missing something somewhere. 
A bit abstruse, sorry. I kind of thought that it was a stretch when I posted it. "45" is obvious, "ø" is the symbol for the empty set, which would be applied to the "19", which is what numerical value his presidency would have if qanon had some sort of truth. Yeah, I failed on that.