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Re:GitHub Octicons by michaelbuckbee on Monday June 16, 2014 @02:33PM (#7900655)
They don't mention this on the page, but this is an icon font (like FontAwesome). The zip includes CSS/SCSS referencing the ttf, svg, woff and eot files.

Released under MIT + Open Font License

Re:GitHub Octicons by reledi on Monday June 16, 2014 @03:08PM (#7900856)
The blog post [1] mentions that it's an icon font.

1: https://github.com/blog/1851-octicons-for-everyone