Google 代码提供的这张图片是什么？
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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这是一个QR 码，经常用于在手机中输入网址。如果有人发布可以安装在 Android 手机上的软件，这会很有帮助；您无需在手机键盘上手动输入 URL，只需使用 条形码扫描仪 从开源ZXing 项目轻松扫描它。
如果您不尝试直接下载一些东西到你的手机上，它可能没有那么有用。
This is a QR code, frequently used for entering URLs into mobile phones. It can be helpful if someone posts software that could be installed, say, on an Android phone; instead of manually entering the URL on the phone keyboard, you can just use an app like Barcode Scanner from the open source ZXing project to easily scan it in.
If you're not trying to download something directly onto your phone, it's probably not all that useful.
它是一个 QR 码，并对少量数据（通常是 URL）进行编码。您可以使用手机等方式扫描它们，然后访问 URL。
[更新：这是下载 msysGit 的网址。]
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.]
这是一个二维条形码。那里有软件可以扫描它。
It's a 2-Dimensional Barcode. There's software out there that can scan it.