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- M rating: An old MPAA rating used from 1968 until 1970.
- ESRB Mature 17+: The current ESRB rating, equivalent to an R rating for movies.
- New Zealand M rating: A New Zealand classification rating, mandated by the OFLC and used since 1993.
- TV-M: An early version of what is now TV-MA, replaced due to trademark from the ESRB.
- M (Australia): An Australian classification category