It's a ranking system based on how many posts you've err, posted on this board (not just this forum but the entire IW board).
Apart from the graphics (some of which are truly hideous) there's nothing else to it.
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"Butt-kicking for goodness!" - Minsc
"Cities always teem with evil and decay. Let's give it a good shake and SEE WHAT FALLS OUT!!" - Minsc
