Summary Box: Bar codes posted around town can trigger content in phone apps

Summary Box: Bar codes get around, get more useful

WHAT’S HAPPENING: Variations on bar codes, once used just to keep track of inventory at stores, are showing up around town with a different look and more functions.

BEYOND THE BAR: One cousin of the traditional bar code, the QR code, looks like a bunch of small squares inside a larger square. Google uses these on decals it sends to businesses.

HOW IT WORKS: Consumers read the code with a cell phone camera and scanning application, and are directed to a Web page or other online content. The codes on Google’s stickers link to a mobile version of a page where businesses can post coupons.