QR or Quick Response

You have surely seen these funny looking black and white squares.

A Media Specialist's Guide to the Internet has an explanation of what and how the QR codes work. 

"QR stands for Quick Response, and is made up of black modules in a square shape on a white background.Actually, you could call it a 3D bar code.  The encoded text in the square can represent a web address or text. Camera phones (with a QR app) or QR readers can read the encoded message."

The blog entry has links to ideas on using the QR code in the classroom.  And QRstuff.com  provides more information on the codes, a code generator and phone information.