First visit http://fontawesome.io/cheatsheet/, then it's your turn. Please don't leave this for me to fix, because you'll hate it. There are a few icons we'll have to map to something appropriate - such as "matrix"; though there are some interesting options - and you can always dip into unicode if you don't find something appropriate here; though I would suggest that *if* you do this to create an icon-xyz class wrapper to the HTML "i" tag so that it's handled exactly the same.