Google Code provides a barcode like this:

When you download software. What is its purpose (I assume it is related to the SHA1 checksum, but if so, how is it used)?
Edit: Now that I know its name, I found this article. Thanks!
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It’s a QR code and encodes a small amount of data – typically a URL. You can scan them for example using a phone and then visit the URL.
[Update: it’s a URL for downloading msysGit.]