Definitions from Wiktionary (X)

▸ noun:  A placeholder for an unknown, suppressed or hypothetical name.
▸ noun:  (anthroponymy, politics) A surname, used by those who have had their identity or heritage, including their proper ancestral names, erased or forgotten.
▸ noun:  (social media) An online social media network, formerly known as Twitter.
▸ noun:  Any mark that looks like that letter, such as a mark made by a person who cannot read or write in lieu of a signature.
▸ noun:  (lacrosse) The spot behind the goal.
▸ adjective:  Intersex or non-binary (in passports and identification documents).
▸ noun:  (slang) Ecstasy, a particular street drug.
▸ adjective:  (British film certificate, dated) Suitable only for those aged sixteen or (later) eighteen years and over.
▸ adjective:  (originally movie rating) Obscene; adult; pornographic; XXX.
▸ noun:  (informal) Christ
▸ noun:  Cross, crossing.
▸ adjective:  (informal) Abbreviation of extreme. [Of a place, the most remote, farthest or outermost.]
▸ adjective:  Alternative letter-case form of X (“intersex or non-binary, in passports and identification documents”) [Intersex or non-binary (in passports and identification documents).]

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