QR code

«QR Code — abbreviated from Quick Response Code — is the trademark for a type of matrix barcode (or two-dimensional code) first designed for the automotive industry. More recently, the system has become popular outside of the industry due to its fast readability and large storage capacity compared to standard UPC barcodes. The code consists of black modules arranged in a square pattern on a white background….
…The reason why they are more useful than a standard barcode is that they can store (and digitally present) much more data, including url links, geo coordinates, and text. …» (Wikipedia)

QR codes (wikipedia)

QR codes (wikipedia)

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