is there a list of ALL the media ratings and what they mean?

OrganizedChaos

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Apr 21, 2002
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google gave me this http://www.filmratings.com/guide.htm

but there are ratings that aren't on there

found this on IMDB


USA:(Banned) (4) / USA:AO (3) / USA:Approved (4557) / USA:E (372) / USA:G (1318) / USA:GP (267) / USA:K-A (25) / USA:M (354) / USA:NC-17 (130) / USA:Not Rated (361) / USA:eek:pen (33) / USA:passed (184) / USA:pG (3925) / USA:pG-13 (2275) / USA:R (10312) / USA:T (340) / USA:TV-14 (69) / USA:TV-G (85) / USA:TV-MA (27) / USA:TV-PG (93) / USA:TV-Y (112) / USA:TV-Y7 (128) / USA:Unrated (2875) / USA:X (5283)

open seems to mean that the rating was surrendered but i can't figure out what that means. GP seems to contain some horror movies but i can't figure out what separates it from NC-17. some seem to be for video games and some only used for T.V. shows. X seems to be for porn and things considered "obscene" but i'm not sure who decides what is obscene and what isn't. banned seems to reserved for movies that have legal injuctions against them.