See one of those 2-dimentional barcodes (a square with a bunch of small squares inside). Like this one
This is called a QR-code. See the Wikipedia Article here. For more information.
Many smart cell phones have apps that can read these codes and take you to a website or provide contact information.
ZXing Decoder Online is provided by Zebra Crossing, and May decode a QR-code and tell you what information is in the code. I have decoded a few with this website, but several that I have tried did not work. Maybe there is a better one out there.
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