[corben]

Most of the fonts loaded are variations of Open Sans, which are used throughout the pages. We'll look into improving the degradation when the icon font loads; it's just the Octicon font set. Thanks for pointing this out.

[sp332]

Instead of using Octicon, you could use the Unicode characters for circle-i U+24D8, checkmark U+2713, and calendar U+1F4C5.

[rodrigocoelho]

You can subset the font with Fontello.

http://fontello.com

[vim_wannabe]

Why not use whatever font hn uses? hehe