I've wondered about these for a while. QR means quick reference. It's like a bar code and can be scanned by newer smartphones. When scanned, information is automatically loaded in the phone. They can contain contact information (like a business card), documents, or directly link to a website. This one takes you to this blog. I'd be interested to know if this code works on your device. I may use this in a variety of print applications. Even considering a scannable wooden sign.
See more artwork from Jason Jaspersen at jjjaspersen.com, and on social networks such as Facebook, Twitter, and LinkedIn.