what in the heck is that on the back of this chip?? I mean, I can see that it's a geometric design....but WHY?? I couldn't find the chip listed in TCR or C&W, is it a "test" chip?

(don't know the seller, it's an auction that we were watching)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3255416533&category=899