Everyone knows the ubiquitous bar coding — though reading it might be another matter. But I for one wasn’t acquainted with it’s potential replacement, QR Code — QR for “quick response” apparently. What you see below is a large version of a QR Code symbol that contains the first 250 characters of the “About Slaw” page.
(I imagine, but don’t know, that the object could be shrunk considerably, the only limit being its readability by a scanner.) By comparison, a bar code can only contain 20 digits.
Invented in Japan in 1994, QR Code is gradually spreading throughout the world. . . . [more]