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X, or x, is the twenty-fourth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ex (pronounced ), plural exes. History The letter ⟨X⟩, representing /ks/, was inherited from the Etruscan alphabet. It perhaps originated in the ⟨Χ⟩ of the Euboean alphabet or another Western Greek alphabet, which also represented /ks/. Its relationship with the ⟨Χ⟩ of the Eastern Greek alphabets, which represented /kʰ/, is uncertain. The pronunciation of /ks/ in the Romance languages underwent sound changes, with various outcomes: French: /js/ (e.g. laisser from laxare) Italian: /ss/ (e.g. asse from axem) and, in some cases, /ʃʃ/ (e.g. lasciare from laxare) Portuguese: /jʃ/ (e.g. eixo from axem) Romanian: /ps/ (e.g. coapsă from coxa) and /s/ (e.g. lăsa from laxare) Old Spanish: /ʃ/ Spanish: /x/ (e.g. cuja from coxa) In Old Spanish, ⟨x⟩ thus came to represent /ʃ/, which it still represents in most Iberian languages and in the orthographies of other languages influenced by Spanish, such as Nahuatl. In French (with a few exceptions), Italian, Romanian, and modern Spanish, ⟨x⟩ was replaced by other letters. The use of ⟨x⟩ to represent /ks/ was reintroduced to the Romance languages via Latin loanwords. In many words this /ks/ was voiced to /gz/. Use in writing systems English In English orthography, ⟨x⟩ is typically pronounced as the voiceless consonant cluster when it follows the stressed vowel (e.g. ox), and the voiced consonant when it precedes the stressed vowel (e.g. exam). It is also pronounced when it precedes a silent ⟨h⟩ and a stressed vowel (e.g. exhaust). Due to yod-coalescence, the sequence ⟨xi⟩ before a vowel can be pronounced resulting from earlier , e.g. in -xion(-), -xious(-). Similarly, the sequence ⟨xu⟩ can be pronounced with (e.g. flexure, sexual) or (in luxury and its derivatives) Due to NG-coalescence, the sequence ⟨nx⟩ can be pronounced in anxiety. When ⟨x⟩ ends a word, it is always (e.g. fax), except in loan words such as faux (see French, below). There are very few English words that start with ⟨x⟩ (the fewest of any letter). When ⟨x⟩ does start a word, it is usually pronounced 'z' (e.g. xylophone, xanthan). When starting in some names or as its own representation it is pronounced 'eks', in rare recent loanwords or foreign proper names, it can also be pronounced (e.g. the obsolete Vietnamese monetary unit xu) or (e.g. Chinese names starting with Xi like Xiaomi or Xinjiang). Many of the words that start with ⟨x⟩ are of Greek origin, or standardized trademarks (Xerox) or acronyms (XC). In abbreviations, it can represent "trans-" (e.g. XMIT for transmit, XFER for transfer), "cross-" (e.g. X-ing for crossing, XREF for cross-reference), "Christ-" (e.g. Xmas for Christmas, Xian for Christian), the "crys-" in crystal (XTAL), "by" (SXSW for South by Southwest) or various words starting with "ex-" (e.g. XL for extra large, XOR for exclusive-or, or the extinction symbol). X is the third least frequently used letter in English (after ⟨q⟩ and ⟨z⟩), with a frequency of about 0.15% in words. Other languages In Latin, ⟨x⟩ stood for [ks]. In some languages, as a result of assorted phonetic changes, handwriting adaptations or simply spelling convention, ⟨x⟩ has other pronunciations: In Basque, ⟨x⟩ represents [ʃ]. Additionally there is the digraph ⟨tx⟩ [tʃ]. In Dutch, ⟨x⟩ usually represents [ks], except in the name of the island of Texel, which is pronounced Tessel. This is because of historical sound-changes in Dutch, where all /ks/ sounds have been replaced by /s/ sounds. Words with an ⟨x⟩ in the Dutch language are nowadays usually loanwords. In the Dutch-speaking part of Belgium, family names with ⟨x⟩ are not uncommon (e.g. Dierckx, Hendrickx, Koninckx, Sterckx, Vranckx). In Norwegian, ⟨x⟩ is generally pronounced [ks], but since the 19th century, there has been a tendency to spell it out as ⟨ks⟩; it may still be retained in personal names, though it is fairly rare, and occurs mostly in foreign words and SMS language. Usage in Danish and Finnish is similar (while Swedish, on the other hand, makes frequent use of ⟨x⟩ in native words as well as in loanwords). In German, generally pronounced [ks]; in native words, however, such as Ochs or wachsen, the cluster [ks] is often written ⟨chs⟩. French: at the ends of words, silent (or [z] in liaison if the next word starts with a vowel). Three exceptions are pronounced [s]: six ("six"), dix ("ten") and in some city names such as Bruxelles (although some people pronounce it 'ks') or Auxerre; it is fully pronounced [ks] in Aix, the name of several towns. It is pronounced [z] in sixième and dixième. Otherwise [ks] or (primarily in words beginning with ex- followed by a vowel) [ɡz]. In Italian, ⟨x⟩ is either pronounced [ks], as in extra, uxorio, xilofono, or [ɡz], as exogamia, when it is preceded by ⟨e⟩ and followed by a vowel. In several related languages, notably Venetian, it represents the voiced sibilant [z]. It is also used, mainly amongst the young people, as a short written form for "per", meaning "for": for example, "x sempre" ("forever"). This is because in Italian the multiplication sign (similar to ⟨x⟩) is called "per". However, ⟨x⟩ is found only in loanwords, as it is not part of the standard Italian alphabet; in most words with ⟨x⟩, this letter may be replaced with 's' or 'ss' (with different pronunciation: xilofono/silofono, taxi/tassì) or, rarely, by 'cs' (with the same pronunciation: claxon/clacson). In Old Spanish, ⟨x⟩ was pronounced [ʃ], as it is still currently in other Iberian Romance languages. Later, the sound evolved to a hard [x] sound. In modern Spanish, due to a spelling reform, whenever ⟨x⟩ is used for the [x] sound it has been replaced with ⟨j⟩, including in words that originally had ⟨x⟩ such as ejemplo or ejercicio, though ⟨x⟩ is still retained for some names (notably 'México', even though 'Méjico' may sometimes be used in Spain). Presently, ⟨x⟩ represents the sound [s] (word-initially), or the consonant cluster [ks] (e.g. oxígeno, examen). Rarely, it can be pronounced [ʃ] as in Old Spanish in some proper nouns such as 'Raxel' (a variant of Rachel) and Uxmal. In Galician and Leonese, ⟨x⟩ is pronounced [ʃ] in most cases (often used in place of etymological g or j). The pronunciation [ks] occurs in learned words, such as 'taxativo' (taxing). However, Galician speakers tend to pronounce it [s], especially when it appears before plosives, such as in 'externo' (external). In Catalan, ⟨x⟩ has three sounds; the most common is [ʃ]; as in 'xarop' (syrup). Other sounds are: [ks]; 'fixar' (to fix), [ɡz]; 'examen'. In addition, [ʃ] gets voiced to [ʒ] before voiced consonants; 'caixmir'. Catalan also has the digraph ⟨tx⟩, pronounced [tʃ]. In Portuguese, ⟨x⟩ has four main sounds; the most common is [ʃ], as in 'xícara' (cup). The other sounds are: [ks] as in 'flexão' (flexion); [s], when preceded by.... 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