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I guess QR codes have taken the place. But it feels very rare to see QR codes in print, other than when at restaurants.

I hadn't considered this before but "QR code" starts with a "cue" sound, which is somewhat amusing overlap.

I work as a lecturer on a college campus. Printed QR codes are everywhere.

I even give a lecture to my advanced compsec class where I take a bunch of real flyers from all around campus and replace them with my own QR code.