There are: G, PG, PG-13, R, and NC-17.
'D' may be used in television or in other countries.
Another answer:
I believe the answer is drugs or drug use. 2011 Movie "Hobo with a shotgun" has a D rating included. There was quite a bit of Deviant behavior in the movie with prostitutes and children. Many main stream movies with all kinds of drug use have no D rating included.
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D means dialogue
L means language
V means violence
S means sex
X means extreme violence and sex; only for adults it is an older version of NC-17
FV means fantasy violence
N means nutity or nakedness
In the United States, there is no D rating for theatrical films. Television does use it for Dialogue.
'l' is for language (probably bad language), 'd' is for dialog (suggestive or explicit exchanges) and 'v' is violence.
Mature audience required
check the classification. It means the movie has not been rated yet.
If you mean the movie "IT" About the scary clown, then rated R for sure. if you are talking about another movie i have no clue.
It means that the movie has some language and violence.