What are all these Notations?

In chess game analysis, I always see these symbols next to the move made...

Like:

Rxe8! or Qd2? or Kf1?! or g6!? or Bxa1!! and even Na4!?!?!

What do they mean?

? =  mistake

?? = blunder

! = good move

!!= brilliant move

!? = interesting move

?! = dubious move

!?!?! = I'm a patzer who wants to appear interesting

! Good Move

!! Very good move

? bad move

?? blunder

?! Dubious Move

!? Speculative attempt to complicate (really, I read that in a book once)

! = Good move

? = Bad move

!? = Interesting/unusual but probably good move

?! = Interesting/unusual but probably bad move

!! = Very good move

?? = Horrendous

!?!?! = ?

haha.. LOL

Anyways.. thanks for the info. But how does the analyzer know weather the move was good or bad? (Unless ofcourse it was REALLY obvious)

*whether :P

@ideal_zugzwang

Well it is the opinion off the analyzer.  These days, they mostly check it with a strong engine, but in old books for example you could find a "!"  when modern analyses has proven that the move deserves  a "?" instead. (or vice versa)