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Hello World
The above is the “Hello World” for QR Codes.

QR code (wiki) in short:

A QR Code is a matrix code (or two-dimensional bar code) created by Japanese corporation Denso-Wave in 1994. The “QR” is derived from “Quick Response”, as the creator intended the code to allow its contents to be decoded at high speed.

Come across it while looking up the Google Charts API. And the Google Charts API is kinda cool also.

And since I am at it, we have:
hackerspace.sg
Which is the QR Code for “ hackerspace.sg“.

Note that upper and lower caps matters.