There's an old (2014y) conversation about this: Let's design a nice badge icon!, but without any real outcome.
However, quite recently we got a new site design, including our new logo:
For me it looks like pretty good candidate for badge icon, because, you know, it's a medal.
- Cut a strip a little bit (get rid of horizontal part).
- Remove strip completely (and left only medal itself).
- Make strip white (like done on meta).
What do you think about this idea?