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Originally posted by: Count Dushku
Imperial symbol...symbol of The Grand Army of the Republic, not necessarily the Republic itself. Or, in an ironic twist, it could be a Jedi symbol.

I believe its for the Grand Army, now that you mention it specifically.
The Republic emblem was the one on the Senate podium (and is used in the sw.com databank backgrounds).
I don't think its a Jedi emblem, because as I recall, in AOTC, its on the helmets of the Clone Pilots (that fly the Attack Gunships). I'd have to go back and take a look.