QR code

QR codes (Quick Response Code) are a type of matrix code. It was designed by the Japanese company Denso-Wave in 1994 for encoding web addresses, telephone numbers, SMS messages, text and more. If you are the fortunate owner of a camera-equipped cell phone, you can install on it a special program for recognizing these matrix codes and save a great deal of time entering, for example, web addresses on your cell phone. You can find more detailed information on wikipedia.org

is how the link to webmoney.ru looks.

There are many programs for recognizing matrix codes, here are a few of them: