Symbology is the study of symbols. Here are some simple symbological examples from that now standard
dirty dirty English alphabet:
b and d are obviously erections viewed from the guys right and left
respectively, while p and q are when he's soft, standing on his head, or on top.
V and W, a-la Dan Brown, mentioned by another poster are the chalices, therefore obviously symbolize three bitches with their legs spread, the W of course, is preferably twins, while v and w are hopefully at least 18.
U and n I
personally take to be cups, one upright, the other spilled, which I why the prefix "un" is nearly always preferable to the prefix "in"
B of course then is boobs or buttcheeks
O and o, as in orifice(s) are obvious (men only have two)
g and q in different fonts therefore are those guys with curved dicks.
and so on and so forth