Can someone tell me where to look for the meaning of those little icons to the left of forum topics?

I can't immediately find where they are described, but this is what they mean:

Yellow Star: 'Sticky' thread; - will always stay at the top of the list
Red Octagon: Closed thread; - no new posts accepted

Blue chat bubbles = it's a post (for the most part lol)

Red chat bubble = Some posts inside that forum have not been read by you yet.

That's about all there is really, and I don't think there's any legend anywhere for it as it's not a totally canned forum from what I understand and it's programmed by CC so it's probably never been done up anywhere