Looks like Inconsolata [1] to me. The slashes are set slightly higher than the pipe, the asterisk is vertically center-aligned (as opposed to super-positioned as with Consolas, Monaco, Vera Sans Mono and others), a distinctive upward curve on its lowercase 'y', and it has a looptail lowercase 'g'.
(in ~/.gitconfig under the [alias] section...)
h = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --date=relative
https://img.skitch.com/20120619-c9xq67ysdbmrasmfgur6raba1d.p...
I'd love to see how stuff like this spreads. I just use git h because the person that gave it to me used that.