perhaps it's this

[korn469]

yes it was in responce to the peace symbol threads...i accidently started a new thread...sorry

but what i suggested is that i think it's either a revolt symbol or a "we love" day symbol

korn469

[SerapisIV]

If you're talking about the peace symbols, sounds like a very good possibility. Nice thinking.

[Buck Birdseed]

I think it's a place-holder myself... Look at newicons.pcx in your SMAC directory and you will see exactly the same symbol there, which (I believe) wasn't used in the game (might be wrong).