QR Codes are graphical codes displayed in B&W images that can display a website or general information. This one says "WTF?".
You can read these with a smart phone that is eabled via software to decode these. My iPhone does this easily and there are several apps that can decode these and even, as in this case, actually make a QR code.
In Japan, these are all the rage. Look for these to pop up in the US a lot more in the next few years.
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