What is the "83" underneath you ask? perhaps... one of the explanations here?
Urban Dictionary 83
Cover-up term for bisexual.
This is because of the periodic table of the chemical
elements (chemistry): The 83rd element is Bismuth,
which is abbreviated with "Bi".
(67 42 = Homo)
Don't tell anyone he's 83!
plus look at the way he signs his name: Bi