I recently got sucked down a QR code rabbit hole, where I learned there is an almost-endless number of unique codes to which information can be linked, each with a different high contrast pattern. There are currently 40 versions. The higher the QR code version, the more data modules there are. And the more modules there are, the more data the QR code can hold.

This one is Version 2 with a 25 x 25 array of modules.

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