Actually, it's kind of a really bad joke.
I hate 'pithy' avatars. I had my own picture there for a long time, but kept getting complaint after complaint after complaint about it. Apparently, people don't want to see real faces. So, I went hunting for the campiest thing I could find. Low-and-behold, I found this picture of a kit-bashed G.I. Joe Action-Team doll, that looks like Stefan with a full beard! The pendant around his neck is actually "AT" for "Action Team" (I had all the gear when I was a kid), but it really does, ironically, look like the anarchy symbol.
So, I've got all kinds of layered irony in this picture: A doll, that looks like Stefan, that wears a symbol that looks like the anarchy sign, that's REALLY a hired gun who works on a special team that does covert interventions into foreign countries, kills people, and steals things - all in the name of American Patriotism.