Is there a topic icon legend somewhere?

[AtWitsEnd]

I wasn't sure where else to post this question. I've figured out that when you roll your curser over a topic icon it gives you some general information. For example, grey topic icon = no new posts, red topic icon = new posts, icon w/arrow = moved post, etc. But I'm seeing a couple of other icons and when I roll my curser, they give me no information. For example, I've seen rolling grey icons and icons with a little red star in the upper right hand corner. Is there a legend somewhere to interpret these? Maybe I'm a bit of a boob but I can't seem to find one. Thanks

 

[AtWitsEnd]

OK. Sorry I bothered you guys with that. I think I've got it figured out. Rolling is a "hot topic" and the red star indicates that it's one of my topics when I'm logged on.