(abbreviated from Quick Response code)[, it] is a specific matrix barcode (or two-dimensional code) that is readable by dedicated QR readers, smartphones, and, to a less common extent, computers with webcams. The code consists of black modules arranged in a square pattern on a white background. The information encoded may be text, URL, or other data.
In the interest of experimentation, I generated a QR code for this august journal using Kaywa's free, online service.
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Of course, if you're viewing this post on your smartphone, this could be one of the most useless blog posts ever.
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