Oh man, that's a really cool feature. I hope they fix it so that they look right on people using Chrome and other browsers!
Not quite a feature…
For the first attempt I used obscure glyphs from the system font. They dont' seem to display the same in all browsers so it's a no go.
I then simply created a bunch of symbols and uploaded them as an album to a free image hosting website. Works better but we're limited to only 10 pictures per post so it's kind of limiting if you want to describe multiple dice pools.
I've sent a suggestion to the moderators to include the EotE symbols as a smiley palette. Not sure if it would work. The smileys might be shared across all game forums so it would be confusing.