Thread icons

[PotS]

I searched, but didn't find anything.

Is there anything showing what the little envelope-type icons next to threads are? There's a closed envelope, an open one, a blue one, one with an arrow, etc.

Every time I think I've figured out what each one means, I get proven wrong.

 

[utvolpj]

it's there but kinda hidden at the very bottom of the forum page

 

[PotS]

thank you sir.