Many of the words that start with ⟨x⟩ are of Greek origin, or standardized trademarks (Xerox) or acronyms (XC). XMIT for transmit, XFER for transfer), "cross-" (e.g.X-ing for crossing, XREF for cross-reference), "Christ-" as shorthand for the labarum (e.g.Movies with an X rating may only be shown in specific theaters (which hardly exist nowadays in France); they bear special taxes and tax rates, including a 33% tax on revenue.In 2000, some conservative associations sued the government for granting the movie Baise-moi, which contained graphic, realistic scenes of sex and violence, a non-X classification.The Conseil d'État at litigation ruled that the movie should have been rated X.The decision was highly controversial, and some suggested changing the law under which it was rated 18.It can be used as an abbreviation for 'between' in the context of historical dating; e.g., '1483 x 1485'.
The modern tradition of using x to represent an unknown was introduced by René Descartes in La Géométrie (1637).
In 1975, the X classification (officially: "pornographic or violence-inciting movies") was created for pornographic movies, or movies with successions of scenes of graphic violence.
The commission has some leeway in classification, it may for instance take into account the artistic qualities of a movie not to count it pornographic.
In mathematical typesetting, x meaning an algebraic variable is normally in italic type (), partly to avoid confusion with the multiplication symbol.
In fonts containing both x (the letter) and × (the multiplication sign), the two glyphs are dissimilar.