Based on Crow's Foot notation:
Intended meanings as drawn (artistic licence employed):
One (and only one) Database Administrators site
Zero or many site achievements
Zero or one featured meta questions (typically; of course right now we have two)
The far terminator is currently a circle. I guess this could ...
How about something like:
I'm sure the nice folks from Stackexchange can produce specs with exact dimensions and suchlike. If necessary I've got Adobe CS6, visio etc. and could knock up a model that's not based on someone's production system.
Getting the image to tesselate correctly down the left hand side of the page might need a bit of work.
Quick and dirty (click to embiggen). This is just the concept - since we don't seem to be afraid of using copyrighted images (e.g. meta and main both use Flight of the Concords). I would also color the HAL blue to better match our theme.