What does the symbol on Herman Cain's bus stand for?

Gene L

It's a square with three squares inside it. And what looks like pixels inside the square. I've seen it in other places, but don't know enough about it to google it. It looks like computer stuff.

bullsi1911

Probably a QR code:

http://en.wikipedia.org/wiki/QR_code

Gene L

Yep, that's it. I wonder what its purpose is on a campaign bus.

breamfisher

So somebody with a smart phone can scan it and get the secret code.

Make_My_Day

My understanding of those coded squares, is you scan them with a smartphone, and it automatically dials up their website or information about the candidate.