Monster icons

Hello I was just curious if anyone could explain to me or point me in the right direction. I'd like to know the difference between monster icons. For example if you're on a quest a monster will have the letter Q over his head. If it's a hunting log monster itll have a swirly sign.

I ran into a mob with a star near his name today and I didn't know what that was. Also I have seen mobs with a blue triple triangle around their name also.

Does anyone have a link to explain these + others. Like aggressors, or if a mob is an HM.