That "S" symbol that they never explained

This symbol is seen throughout the entire show. You see it on the 9th Wonders comic books. You see Ren had a necklace of it (which he had to use as a key on the Gateway properties), and so did the Haitian (HRG looked at it later in his car like it had some meaning). You see it on Katana Girl's (or is it Hiro's?) sword. You see it in the Renautas building (on the wall). It was on the official posters and paraphernalia, and I believe the logo, for the June 13 summit.

My question is, what is it? What does it mean? At first I thought it was the symbol for Evos and their cause. But... it's all over the Renautas building, where they bag and tag evos... So no.