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On it's forhead there is a round "Halo" shaped symbol. Now you may speculate.
I noticed that on the making of Halo 2 movie, I can't think right now, but it indicates some kind of Forerunner connection. [Edited on 5/5/2004 12:59:40 PM]
if u look on most covenant things there is a weird circle. for instance the elites back
Yeah I've noticed that on the backs of the Black Elites,and on the Bases in Blood Gulch
This is because the covenant are imitative that means they replicate another races technology. Every thing they have is the forerunner's.