(slang) Ecstasy, a particular street drug.

(Britain film certificate, dated) Suitable only for those aged 16 or (later) 18 years and over. / (movie rating) Obscene.

(informal) Christ

(Canada, US) Cross, crossing.

Used to represent a value that may vary: see x.

(slang) Used to replace a -ks- sound, such as in hax (“hacks”), pix (“pics”), punx (“punks”), folx (“folks”).

An abbreviation marker.

(neologism) Used to replace a gendered suffix, such as in alumnx, Chicanx, Latinx.

The twenty-fourth letter of the English alphabet, called ex and written in the Latin script.

(fandom slang) Used between the names of two characters to denote a ship, particularly in anime, manga, and video games. / (music) Used in place of and in artist collaborations.