X

From the Etruscan letter 𐌗 (x, “ex”), from the Ancient Greek letter Χ (Kh, “chi”), created ex nihilo.

X (lower case x)

1. The twenty-fourth letter of the basic modern Latin alphabet.

• (Latin script):  Aa  Bb  Cc  Dd  Ee  Ff  Gg  Hh  Ii  Jj  Kk  Ll  Mm  Nn  Oo  Pp  Qq  Rr  Sſs  Tt  Uu  Vv  Ww  x  Yy  Zz
• (Variations of letter X):  Ẍẍ  Ẋẋ  ᶍ  Ｘｘ

X

2. The Roman numeral ten (10).
3. (especially in the names of aristocracy) The tenth.
5. October.

   Comeronyms: I, i, 1; II, ii, 2; III, iii, 3; IV, iv, 4; V, v, 5; VI, vi, 6; VII, vii, 7; VIII, viii, 8; IX, ix, 9; XI, xi, 11; XII, xii, 12

• x
• VV, vv (nonstandard)
• X. (ordinal number)

• OS X
• Sol X

X

1. (bowling) A strike.

   Coordinate term: / (spare)

2. (sports) A fail.

   Coordinate terms: O (success), - (skip)

3. One of the tristimulus values which, with Y and Z, defines coordinates in a three-dimensional color space. Pronounced (in English) big X or cap X.
   • 2003, Charles A. Poynton, Digital Video and HDTV: Algorithms and Interfaces (in English), →ISBN, page 217:

     X, Y and Z are pronounced big-X, big-Y, and big-Z, or cap-X, cap-Y, and cap-Z, to distinguish them from little x and little y, to be described in a moment.

5. A placeholder for any letter or word.

   Alternative form: x

7. alternative letter-case form of x (“a kiss”)
   • 2017, Jason Wallace, Encounters‎^[1] (in English), London: Andersen Press, →ISBN:

     For Hugo – treat life well X

8. (linguistics) A wildcard for any sound (consonant, vowel or tone).
9. (international standards) Substituted for the third letter of a currency code to denote the minor unit of that currency.
10. (chemistry) Halogen.

Possibly from skull and crossbones.

X

1. A hazard indicator, sometimes incorporated into standard labeling and signage systems.

• XXX

• Letter styles
• Uppercase and lowercase versions of X, in normal and italic type
• Uppercase and lowercase X in Fraktur

Character=X

Other representations of X:

• (letter name) IPA^(key): /ɛks/

• Audio (US):

  (file)

• (phoneme)
  • IPA^(key): /ks/, /ɡz/, /kʃ/, /ɡʒ/
  • IPA^(key): /z/, /ʃ/ (word-initially)
• Rhymes: -ɛks
• Homophone: Exe

Introduced by René Descartes in the context of mathematical notation, but has since widened to other contexts.

X

2. An unknown quantity or unknown value.

   Alternative form: x

   Let X represent the forecast traffic flow in 20 years’ time.

   • 2020 January 30, Richard Johns, “Why Physicalism Seems to Be (and Is) Incompatible with Intentionality”, in Acta Analytica‎^[2], →DOI, pages 7-8:

     To know whether a word X is heterological, we must already know what X means. (By contrast, I can know that the word “subdermatoglyphic” has certain syntactic properties—it is six-syllabled, contains the letter “m”, etc.— without having any idea of its meaning.) This indirectness is fine as long as X already has an assigned meaning, for in that case the meaning of “heterological” is ultimately grounded. But when X is the word “heterological”, then we are trying to define “heterological” in terms of itself. We have a closed circle, and a contradictory one, due to the negation operator in the definition.

X

1. A placeholder for an unknown, suppressed or hypothetical name.

   The woman known until now as Witness X has been unmasked after a court ruling.

   Suppose that Mr and Mrs X have been married for many years.

2. (anthroponymy, politics) A surname, used by those who have had their identity or heritage, including their proper ancestral names, erased or forgotten.

   Malcolm X

4. (social media) An online social media network, formerly known as Twitter.

   Alternative form: 𝕏

   • 2025 February 3, Richard Luscombe, “Marco Rubio appoints himself head of USAid as workers locked out of office”, in The Guardian‎^[3], →ISSN:

     Two senior USAid security officials were suspended on Sunday for blocking Doge officials from a restricted area, a day after the agency’s website went offline, and Musk posted to X that USAid was “beyond repair” and needed to be shut down.

• Despite officially rebranding to X in July 2023, the social network is still commonly referred to as Twitter.

• Twitter on Wikipedia.Wikipedia

X (upper case, lower case x, plural Xs or X's)

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

• (Latin-script letters) letter; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

X

2. 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.
3. (lacrosse) The spot behind the goal.

X (not comparable)

2. Intersex or non-binary (in passports and identification documents).

   Alternative form: x

   Coordinate terms: M, F

   • 2019 May 29, Amy Harmon, “Which Box Do You Check? Some States Are Offering a Nonbinary Option”, in The New York Times‎^[4], archived from the original on 8 June 2019:

     So last summer, when the Massachusetts State Legislature became one of the first in the nation to consider a bill to add an “X” option for nonbinary genders to the “M” and “F” on the state driver’s license, El, 17, was less surprised than some at the maneuver that effectively killed it.

Presumably by abbreviation of the pronunciation of ecstasy.

X (uncountable)

1. (slang) Ecstasy, a particular street drug.
   • 2003 January 7, “In da Club” (track 5), in Get Rich or Die Tryin', performed by 50 Cent:

     You can find me in the club, bottle full of bub'. Look, mami, I got the X if you into takin' drugs.

   • 2008, Stephen King, Graduation Weekend:

     Tonight the kids will go out and party down in a more righteous mode. Alcohol and not a few tabs of X will be ingested. Club music will throb through big speakers.

   • 2018 June 8, “Love Druggie”‎^[5]performed by Mendoza:

     I'm a love druggie falling for these drug junkies. Come n call on me besides these X parties. It's fucking hard on my body.

X (not comparable)

1. (British film certificate, dated) Suitable only for those aged sixteen or (later) eighteen years and over.
2. (originally movie rating) Obscene; adult; pornographic; XXX.
   • 1976, Movie Maker, volume 10, numbers 1-6, page 364:

     If you go to an X movie you do so knowingly, as does everyone else in the audience. Or if the same thing comes up on TV you can switch over, or, if you wish, enjoy it in relative privacy.

From Christ by abbreviation, orthographic borrowing from Ancient Greek Χ (Kh, letter chi), from Χριστός (Khristós, “Christ”).

X

2. (informal) Christ

From cross, due to the X symbol being a cross saltire.

X (plural Xes)

1. Cross, crossing.

   Kennington via Charing X

X (comparative more X, superlative most X)

1. (informal) Abbreviation of extreme.

X

1. The eighth letter of the Afar alphabet, written in the Latin script.

• (Latin-script letters) A a, B b, T t, S s, E e, C c, K k, X x, I i, D d, Q q, R r, F f, G g, O o, L l, M m, N n, U u, W w, H h, Y y

• (letter name): IPA^(key): /ɛks/

X (upper case, lower case x)

1. The twenty-fourth letter of the Afrikaans alphabet, written in the Latin script.

• (Latin-script letters) letter; Aa, Bb, Cc, Dd, Ee, Ff, Gg, Hh, Ii, Jj, Kk, Ll, Mm, Nn, Oo, Pp, Qq, Rr, Ss, Tt, Uu, Vv, Ww, Xx, Yy, Zz

X (plural X'e, diminutive X'ie)

1. X

IPA^(key): /d͡z/

X (upper case X, lower case x)

1. The thirty-second letter of the Albanian alphabet, written in the Latin script.

• (Latin-script letters) shkronjë; A a, B b, C c, Ç ç, D d, Dh dh, E e, Ë ë, F f, G g, Gj gj, H h, I i, J j, K k, L l, Ll ll, M m, N n, Nj nj, O o, P p, Q q, R r, Rr rr, S s, Sh sh, T t, Th th, U u, V v, X x, Xh xh, Y y, Z z, Zh zh
• (Arvanitic)
• Greek script letters (script appendix): Α α, Β β, B b, Γ γ, Γϳ γϳ, Δ δ, D d, Ε ε, Ε̱ ε̱, Ζ ζ, Ζ̇ ζ̇, Θ θ, Ι ι, Ϳ ϳ, Κ κ, Κ̇ κ̇, Λ λ, ΛΛ λλ, Λ̇ λ̇, Μ μ, Ν ν, Ν̇ ν̇, Ο ο, Π π, Ρ ρ, Ρ̇ ρ̇, Σ σ, Σ̈ σ̈, Τ τ, Ȣ ȣ, Υ υ, Φ φ, Χ χ, Χ̇ χ̇, ΤΣ τσ, ΤΣ̈ τσ̈, DΣ dσ, DΣ̈ dσ̈ ^[edit]

X upper case (lower case x)

1. The twelfth letter of the Azerbaijani alphabet, written in the Latin script.

• (Latin-script letters) hərf; A a, B b, C c, Ç ç, D d, E e, Ə ə, F f, G g, Ğ ğ, H h, X x, I ı, İ i, J j, K k, Q q, L l, M m, N n, O o, Ö ö, P p, R r, S s, Ş ş, T t, U u, Ü ü, V v, Y y, Z z

• IPA^(key): /iʃa/, [i.ʃa]

X (upper case, lower case x)

1. The twenty-fifth letter of the Basque alphabet, called ixa and written in the Latin script.

• (Latin-script letters) A a, B b, C c (Ç ç), D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, Ñ ñ, O o, P p, Q q, R r, S s, T t, U u (Ü ü), V v, W w, X x, Y y, Z z

• IPA^(key): (Central, Balearic) [ˈiks], [ˈʃeʃ]
• IPA^(key): (Valencia) [ˈiks], [ˈt͡ʃejʃ]

X (upper case, lower case x)

1. The twenty-fourth letter of the Catalan alphabet, called ics or xeix and written in the Latin script.

• raig X (“X-ray”)

• (Latin-script letters) lletres; A a (À à), B b, C c (Ç ç), D d, E e (É é, È è), F f, G g, H h, I i (Í í, Ï ï), J j, K k, L l (L·L l·l), M m, N n, O o (Ó ó, Ò ò), P p, Q q, R r, S s, T t, U u (Ú ú, Ü ü), V v, W w, X x, Y y, Z z

• /ks/

X

1. A letter in the German-based alphabet of Central Franconian.
2. A letter in the Dutch-based alphabet of Central Franconian.

• In the German-based spelling, x is the default spelling for /ks/, but not the most frequent spelling. Following the German cognate or otherwise when there is an intervening morpheme boundary, the spellings chs, cks, ks (possibly also ggs) may be used instead.
• In the Dutch-based spelling, /ks/ is usually represented by ks. The letter x occurs only rarely in loanwords.
• X is never doubled and preceding vowels are short unless they are themselves doubled (as in English).

• IPA^(key): /ʃ/

X (lower case x)

1. A letter of the Mazahua alphabet.

X

1. The twenty-fourth letter of the Latin alphabet.

X

1. The second letter used in Pinyin.

• (letter name) IPA^(key): /ɪks/

• Audio:

  (file)

X (capital, lowercase x)

1. The twenty-fourth letter of the Dutch alphabet, written in the Latin script.

• Previous letter: W
• Next letter: Y

X (upper case, lower case x)

1. (replacement) The letter that represents a diacritic in the x-system, written after the letter in its non-diacriticed form; it is called ikso.

   ambaŭ → ambaux

• (letter name, iks): IPA^(key): /iksː/

X (upper case, lower case x)

1. The thirty-first letter of the Estonian alphabet, called iks and written in the Latin script.

• (Latin-script letters) täht; A a, B b (C c), D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p (Q q), R r, S s, Š š, Z z, Ž ž, T t, U u, V v (W w), Õ õ, Ä ä, Ö ö, Ü ü (X x, Y y)

The Finnish orthography using the Latin script was based on those of Swedish, German and Latin, and was first used in the mid-16th century. No earlier script is known. See the Wikipedia article on Finnish for more information, and X for information on the development of the glyph itself.

X (upper case, lower case x)

1. The twenty-third letter of the Finnish alphabet, called äks or eks and written in the Latin script.

• Used only in loanwords. In more established loanwords, it is replaced with ks.

• (Latin-script letters) kirjain; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s (Š š), T t, U u, V v (W w), X x, Y y, Z z (Ž ž), Å å, Ä ä, Ö ö

• IPA^(key): /iks/

• Audio (Paris):

  (file)

X (upper case, lower case x)

1. The twenty-fourth letter of the French alphabet, called ixe and written in the Latin script.

X m or f (plural X)

1. X-frame stool
   • 1862, Victor Hugo, chapter 1, in Les Misérables, Tome I : Fantine, book 3:

     La duchesse de Duras lisait à trois ou quatre amis, dans son boudoir meublé d’X en satin bleu ciel […] .

     The Duchess de Duras was reading to two or three friends, in a boudoir furnished with X-frame stools in sky-blue satin.

X (invariable)

1. X-rated

• film X

• IPA^(key): /ʔɪks/

• Audio:

  (file)

• Rhymes: -ɪks

X (upper case, lower case x)

1. The twenty-fourth letter of the German alphabet, written in the Latin script.

• IPA^(key): /ç/

X (lower case x)

1. A letter of the Heiltsuk alphabet, written in the Latin script.

• (Latin-script letters) A a, Á á, A̓ a̓, B b, C c, C̓ c̓, D d, Ꟛ ꟛ, G g, Gv gv, Ǧ ǧ, Ǧv ǧv, H h, H̓ h̓, Ħ ħ, I i, Í í, I̓ i̓, K k, Kv kv, K̓ k̓, K̓v k̓v, L l, ʼL l̓, Ḷ ḷ, Ḷ́ ḷ́, ʼḶ ḷ̓, Ɫ ɫ, M m, ʼM m̓, Ṃ ṃ, Ṃ́ ṃ́, ʼṂ ṃ̓, N n, ʼN n̓, Ṇ ṇ, Ṇ́ ṇ́, ʼṆ ṇ̓, P p, P̓ p̓, Q q, Qv qv, Q̓ q̓, Q̓v q̓v, S s, T t, T̓ t̓, Ƛ ƛ, Ƛ̓ ƛ̓, U u, Ú ú, U̓ u̓, W w, ʼW w̓, X x, Xv xv, X̌ x̌, X̌v x̌v, Y y, ʼY y̓, Z z, ʔ

• (letter name) IPA^(key): [ˈiks]
• (phonetic realization) IPA^(key): [ˈks]

X (upper case, lower case x)

1. A letter of the extended Hungarian alphabet, called iksz and written in the Latin script.

• (Latin-script letters) betű; A a, Á á, B b, C c, Cs cs, D d, Dz dz, Dzs dzs, E e, É é, F f, G g, Gy gy, H h, I i, Í í, J j, K k, L l, Ly ly, M m, N n, Ny ny, O o, Ó ó, Ö ö, Ő ő, P p, R r, S s, Sz sz, T t, Ty ty, U u, Ú ú, Ü ü, Ű ű, V v, Z z, Zs zs. Only in the extended alphabet: Q q W w X x Y y. Commonly used: ch. Also defined: à ë. In surnames (selection): ä aa cz ds eé eö ew oe oó th ts ÿ.

X (lower case x)

1. The twenty-seventh letter of the Icelandic alphabet, written in the Latin script.

• (Latin-script letters) bókstafur; A a, Á á, B b, D d, Рð, E e, É é, F f, G g, H h, I i, Í í, J j, K k, L l, M m, N n, O o, Ó ó, P p, R r, S s, T t, U u, Ú ú, V v, X x, Y y, Ý ý, Þ þ, Æ æ, Ö ö

• IPA^(key): /ks/

X (lower case x)

1. The twenty-fourth letter of the Ido alphabet, written in the Latin script.

• (Latin-script letters) litero; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

• (letter name) IPA^(key): /ˈiks/
  • Rhymes: -iks
• (phonemic realization) IPA^(key): /ks/

X f or m (invariable, upper case, lower case x)

1. the twenty-fourth letter of the Latin alphabet, called ics in Italian

• The letter X is not considered part of the Italian alphabet. It is found mainly in loanwords, Latinisms, and Grecisms.

• (Latin-script letters) lettera; A a (À à), B b, C c, D d, E e (É é, È è), F f, G g, H h, I i (Í í, Ì ì, Πî, J j, K k), L l, M m, N n, O o (Ó ó, Ò ò), P p, Q q, R r, S s, T t, U u (Ú ú, Ù ù), V v (W w, X x, Y y), Z z
• Italian alphabet on Wikipedia.Wikipedia

Borrowed from Tagalog X. Letter pronunciation is influenced by English X.

• (letter name) IPA^(key): /ʔeks/ [ʔek̠s]
  • Rhymes: -eks
• (phoneme) IPA^(key): /ks/ [k̠s]

X (upper case, lower case x)

1. The twenty-sixth letter of the Kankanaey alphabet, called eks and written in the Latin script.

• (Latin-script letters) letra; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, Ñ ñ, Ng ng, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

• Komisyon ng Wikang Filipino (2016) Ortograpiya di Kankanaëy [Kankanaey Orthography]‎^[6] (in Kankanaey and Tagalog), →ISBN, pages 10-11

From Japanese ×(ばつ).

X • (X)

1. false.

• O (O)

OX (OX)

• IPA^(key): /x/

X (lower case x)

1. A letter of the Kwak'wala alphabet, written in the Latin script.

• Uʼmista
• (Latin-script letters) A a, A̱ a̱, B b, D d, Dł dł, Dz dz, E e, G g, Gw gw, G̱ g̱, G̱w g̱w, H h, I i, K k, Kw kw, K̓ k̓, K̓w k̓w, Ḵ ḵ, Ḵw ḵw, Ḵ̓ ḵ̓, Ḵ̓w ḵ̓w, L l, ʼL ʼl, Ł ł, M m, ʼM ʼm, N n, ʼN ʼn, O o, P p, P̓ p̓, S s, T t, T̓ t̓, Tł tł, T̓ł t̓ł, Ts ts, T̓s t̓s, U u, W w, ʼW ʼw, X x, Xw xw, X̱ x̱, X̱w x̱w, Y y, ʼY ʼy, ʼ

• Liq̓ʷala
• (Latin-script letters) A a, Ə ə, B b, D d, Ꟛ ꟛ, Dᶻ dᶻ, E e, G g, Gʷ gʷ, Ǧ ǧ, Ǧʷ ǧʷ, H h, I i, K k, Kʷ kʷ, K̓ k̓, K̓ʷ k̓ʷ, Q q, Qʷ qʷ, Q̓ q̓, Q̓ʷ q̓ʷ, L l, L̓ l̓, Ł ł, M m, M̓ m̓, N n, N̓ n̓, O o, P p, P̓ p̓, S s, T t, T̓ t̓, Ƛ ƛ, Ƛ̓ ƛ̓, C c, C̓ c̓, U u, W w, W̓ w̓, X x, Xʷ xʷ, X̌ x̌, X̌ʷ x̌ʷ, Y y, Y̓ y̓, ʔ

Borrowed from Ancient Greek Χ (Kh, “chi”), which represented /ks/ in the dialects of most of the Greek mainland and Euboea.

The sound of X was like that of the Greek Ξ (X, “xi”), that is /ks/, although etymologically it represented not only cs (as in lūx, from luc-s, and dīxī, from dic-si), but also gs (as in lēx, from leg-s; rēxī, from reg-si); hs (as in trāxī, from trah-si; vexī, from veh-si); and chs (as in the word onyx, from onych-s, borrowed from the Greek). The hardening of a softer final (g, h, ch) before s into the с sound, which occurs in the last-mentioned cases, is found also in several roots ending in v and u: nix for niv-s, vīxī for viv-si, connixī for conniv-si, fluxī for fluv-si, from fluō (root fluv-; compare fluvius), struxī for stru-si.

Less frequently x has arisen from the combinations ps and ts: proximus for prop-simus (from prope), nīxus for nit-sus (from nītor), the latter being used along with the collateral form nīsus, as also connīvī with connixī, and mistus (from misceō) with mixtus.

An exchange of the sounds ss or s and x, took place in axis for assis and laxus for lassus. In the later language of the vulgar, the guttural sound in x disappeared, and s or ss was often written for it; as vis for vix, visit for vīxit, unsit for unxit, conflississet for conflixisset, in late inscriptions; hence regularly in Italian, and frequently in the other Romance tongues, the Latin x is represented by s or ss.

By a mere graphic variation, one of the constituent sounds of x is often expressed in inscriptions (but not the earliest) by an additional с or s; as SACXO or SAXSO for saxō; VCXOR or VXSOR for uxor; CONIVNCX or CONIVNXS for conjunx; even both sounds are sometimes thus expressed, VICXSIT for vīxit.

X (upper case, lower case x)

1. The twenty-third letter of the Latin alphabet, written in the Latin script.

X

1. A digit 10 (decem) in the decimal Roman numeral system. Originally a tally mark. It is iterated for multiples.

• Roman numeral letters: I, V, L, C, D, M.
• Unicode glyphs of Roman numerals: Ⅹ, ⅹ.
• Appendixes: Roman numerals, Latin cardinal numerals

• “X” in Charlton T. Lewis and Charles Short [1907], A New Latin Dictionary.

• (letter name) IPA^(key): [ɛk̚s]
• (phonetic realization) IPA^(key): (onset) [z], (coda) [k̚s]

X

1. The twenty-fourth letter of the Malay alphabet, called eks and written in the Latin script.

• (Latin-script letters) A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

X (upper case, lower case x)

1. The twenty-eighth letter of the Maltese alphabet, written in the Latin script.

• (Latin-script letters) ittra; A a, B b, Ċ ċ, D d, E e, F f, Ġ ġ, G g, Għ għ, H h, Ħ ħ, I i, Ie ie, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Ż ż, Z z

X (lower case x)

1. A letter of the Navajo alphabet, written in the Latin script.

• (Latin-script letters) A a (Á á, Ą ą, Ą́ ą́), B b, Ch ch, Chʼ chʼ, D d, Dl dl, Dz dz, E e (É é, Ę ę, Ę́ ę́), G g, Gh gh, H h, Hw hw, X x, I i (Í í, Į į, Į́ į́), J j, K k, Kʼ kʼ, Kw kw, ʼ, L l, Ł ł, M m, N n (Ń ń), O o (Ó ó, Ǫ ǫ, Ǫ́ ǫ́), S s, Sh sh, T t, Tʼ tʼ, Tł tł, Tłʼ tłʼ, Ts ts, Tsʼ tsʼ, W w, Y y, Z z, Zh zh

X (upper case X, lower case x)

1. the 24th letter of the Norwegian alphabet

Mostly used in loan words and foreign names. Also used in old inscriptions and texts instead of ks.

(letter name)

(phonetic realization) IPA^(key): /s/, /z/, /ʃ/, /ks/, /ɡz/

X (upper case, lower case x)

1. The twenty-fourth letter of the Portuguese alphabet, called xis and written in the Latin script.

• (Latin-script letters) letra; A a (Á á, À à,  â, àã), B b, C c (Ç ç), D d, E e (É é, Ê ê), F f, G g, H h, I i (Í í), J j, K k, L l, M m, N n, O o (Ó ó, Ô ô, Õ õ), P p, Q q, R r, S s, T t, U u (Ú ú), V v, W w, X x, Y y, Z z
• xis

• IPA^(key): /x/

X (upper case, lower case x)

1. (International Standard) The eleventh letter of the Romani alphabet, written in the Latin script.
2. (Pan-Vlax) The twelfth letter of the Romani alphabet, written in the Latin script.

• (Latin-script letters) A a, B b, C c, D d, E e, F f, G g, H h, X x, I i, J j, K k, Kh kh, L l, M m, N n, O o, P p, Ph ph, R r, S s, T t, Th th, U u, V v, Z z International Standard: (À à, Ä ä, Ǎ ǎ), Ć ć, Ćh ćh, (È è, Ë ë, Ě ě), (Ì ì, Ï ï, Ǐ ǐ), (Ò ò, Ö ö, Ǒ ǒ), Rr rr, Ś ś, (Ù ù, Ü ü, Ǔ ǔ), Ź ź, Ʒ ʒ, Q q, Ç ç, ϴ θ. Pan-Vlax: Č č, Čh čh, Dž dž, (Dź dź), Ř ř, Š š, (Ś ś), Ž ž, (Ź ź).

• Yūsuke Sumi (2018) “X, x”, in ニューエクスプレス　ロマ（ジプシー）語 [New Express Romani (Gypsy)] (in Japanese), Tokyo: Hakusuisha, →ISBN, page 13

• (phonetic realization) IPA^(key): /ks/, /ɡz/

X (upper case, lower case x)

1. The twenty-ninth letter of the Romanian alphabet, called ics and written in the Latin script.

• (Latin-script letters) A a, Ă ă,  â, B b, C c, D d, E e, F f, G g, H h, I i, Πî, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, Ș ș, T t, Ț ț, U u, V v, W w, X x, Y y, Z z

• (phonetic realization) IPA^(key): /x̠/

X

1. The thirty-fifth letter of the Saanich alphabet, written in the Latin script.

• (Latin-script letters) A, Á, Ⱥ, B, C, Ć, Ȼ, D, E, H, I, Í, J, K, Ꝁ, Ꝃ, ₭, Ḵ, Ḱ, L, Ƚ, M, N, Ṉ, O, P, Q, S, Ś, T, Ⱦ, Ṯ, Ŧ, U, W, W̱, X, X̱, Y, Z, s, ¸

• (letter name) IPA^(key): /ħɑ/
• (phonetic realization) IPA^(key): /ħ/

X upper case (lower case x)

1. The fifth letter of the Somali alphabet, called xa and written in the Latin script.

• The fifth letter of the Somali alphabet, which follows Arabic abjad order. It is preceded by J and followed by KH.

• (Latin-script letters) ʼ, B b, T t, J j, X x, Kh kh, D d, R r, S s, Sh sh, Dh dh, C c, G g, F f, Q q, K k, L l, M m, N n, W w, H h, Y y, A a, E e, I i, O o, U u

• IPA^(key): /ˈekis/ [ˈe.kis]
• Rhymes: -ekis

X (upper case, lower case x)

1. The twenty-fifth letter of the Spanish alphabet, written in the Latin script.

Borrowed from English X.

X ?

1. X (social network formerly known as Twitter)
   • 2025 January 28, Jordan Valinsky, “Google Maps cambiará el nombre del golfo de México por el de "golfo de Estados Unidos"”, in CNN en Español‎^[7]:

     En una publicación en X, Google explicó que tiene una “práctica de larga data de aplicar cambios de nombre cuando se han actualizado en fuentes gubernamentales oficiales”.

     (please add an English translation of this quotation)

Borrowed from Spanish X. Each pronunciation has a different source:

• Filipino alphabet pronunciation is influenced by English X.
• Abecedario pronunciation is from Spanish X.

• (Standard Tagalog)
  • IPA^(key): /ˈʔeks/ [ˈʔɛks] (letter name, Filipino alphabet)
    • Rhymes: -eks
  • IPA^(key): /ˈʔekis/ [ˈʔɛː.xɪs] (letter name, Abecedario)
    • Rhymes: -ekis
  • IPA^(key): /ks/ [ks] (phoneme)
  • IPA^(key): /h/ [h] (phoneme, some Spanish loanwords)

X (upper case, lower case x)

1. The twenty-sixth letter of the Tagalog alphabet (the Filipino alphabet), called eks and written in the Latin script.
2. (historical) The twenty-sixth letter of the Tagalog alphabet (the Abecedario), called equis or ekis and written in the Latin script.

• This letter is mostly used only in proper nouns, unadapted loanwords, or Spanish-based spellings.

• (Latin-script letters) titik; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, Ñ ñ, Ng ng, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

• “X”, in Pambansang Diksiyonaryo | Diksiyonaryo.ph, Manila, 2018

• IPA^(key): /χ/

X (lower case x)

1. A letter of the Tashelhit alphabet, written in the Latin script.

• Berber Latin alphabet on Wikipedia.Wikipedia

• (Hà Nội) IPA^(key): [ʔit̚˧˦ si˨˩], [ʔit̚˧˦ si˨˩], [səː˨˩], [səː˨˩ ɲɛ˧˨ʔ]
• (Huế) IPA^(key): [ʔit̚˦˧˥ ʂɪj˦˩] ~ [ʔit̚˦˧˥ sɪj˦˩], [ʔit̚˦˧˥ sɪj˦˩], [səː˦˩], [səː˦˩ ɲɛ˨˩ʔ]
• (Saigon) IPA^(key): [ʔɨt̚˦˥ ʂɪj˨˩] ~ [ʔɨt̚˦˥ sɪj˨˩], [ʔɨt̚˦˥ sɪj˨˩], [səː˨˩], [səː˨˩ ɲɛ˨˩˨]
• Phonetic spelling: ít sì, ít xì, xờ, xờ nhẹ

X (upper case, lower case x)

1. The twenty-eighth letter of the Vietnamese alphabet, called ích, ích xì, xờ, or xờ nhẹ and written in the Latin script.

• (Quốc ngữ letters) chữ cái; A a (À à, Ả ả, àã, Á á, Ạ ạ), Ă ă (Ằ ằ, Ẳ ẳ, Ẵ ẵ, Ắ ắ, Ặ ặ),  â (Ầ ầ, Ẩ ẩ, Ẫ ẫ, Ấ ấ, Ậ ậ), B b, C c (Ch ch), D d, Đ đ, E e (È è, Ẻ ẻ, Ẽ ẽ, É é, Ẹ ẹ), Ê ê (Ề ề, Ể ể, Ễ ễ, Ế ế, Ệ ệ), G g (Gh gh, Gi gi), H h, I i (Ì ì, Ỉ ỉ, Ĩ ĩ, Í í, Ị ị), K k (Kh kh), L l, M m, N n (Ng ng, Ngh ngh, Nh nh), O o (Ò ò, Ỏ ỏ, Õ õ, Ó ó, Ọ ọ), Ô ô (Ồ ồ, Ổ ổ, Ỗ ỗ, Ố ố, Ộ ộ), Ơ ơ (Ờ ờ, Ở ở, Ỡ ỡ, Ớ ớ, Ợ ợ), P p (Ph ph), Q q (Qu qu), R r, S s, T t (Th th, Tr tr), U u (Ù ù, Ủ ủ, Ũ ũ, Ú ú, Ụ ụ), Ư ư (Ừ ừ, Ử ử, Ữ ữ, Ứ ứ, Ự ự), V v, X x, Y y (Ỳ ỳ, Ỷ ỷ, Ỹ ỹ, Ý ý, Ỵ ỵ)

X (upper case, lower case x)

1. The twenty-fourth letter of the Zulu alphabet, written in the Latin script.

• (Latin-script letters) A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z