File:X MPAA.png - Wikipedia

X (MPAA), Rating System Wiki

X (2022) - IMDb

getTV - The movie ratings system began 51 years ago today — Nov 1, 1968. The first ratings were: G — General Audiences M — Mature (became PG) R — Restricted X —

Hollywood's Battle Against the X Rating, 30 Years Later - The Ringer

8 Provocative Facts About the X Film Rating

X RATING FOR 'ANGEL HEART' IS UPHELD - The New York Times

The X Factor Hat Rating System

1970's X Rating Screen by GrayLord791 on DeviantArt

X-rated Royalty Free Vector Image - VectorStock

original version of the movie ratings poster before the X rating was changed to NC-17 : r/RedditDayOf