Hi Themers,
This month's 'font of the month' is.....
version 4.4.0, shown here on my latest 2.9.1.1 version of Shoehorn using Usman's filter to generate the markup: https://moodle.org/plugins/view/filter_fontawesome.
I've chosen FontAwesome because it is getting better and better with more icons added every release: http://fontawesome.io/icons/ and for ease by which it can be used. Now only if it were in core.... MDL-40759.
Cheers,
Gareth