View source for U

{{Short description|Twenty-first letter of the Latin alphabet}}
{{hatgrp|
{{about|the letter of the alphabet}}
}}
{{pp-semi-vandalism|small=yes}}
{{pp-move|small=yes}}
{{Use mdy dates|date=July 2024}}
{{infobox grapheme
| name = U
| letter = U u
| script = [[Latin script]]
| type = [[Alphabet]]
| typedesc = ic
| language = [[Latin]]
| phonemes = {{hlist
  | {{IPAblink|u}}
  | {{IPAblink|w}}
  | {{IPAblink|ʉ}}
  | {{IPAblink|y}}
  | {{IPAblink|ʏ}}
  | {{IPAblink|h}}
  | {{IPAblink|ʊ}}
  | {{IPAblink|iː}}
  | {{IPAblink|ɨː}}
  | {{IPAblink|ɯ}}
  | {{IPAblink|ɤ}}
  | {{IPAblink|ʌ}}
  | {{IPAblink|ɛ}}
  | {{IPAc-en|j|uː}}
  }}
| no_unicode_code = yes
| unicode = {{hlist|<code>U+0055</code>|<code>U+0075</code>}}
| alphanumber = 21
| fam1 = <hiero>G43</hiero><hiero>T3</hiero>
| fam2 = [[Image:Proto-semiticW-01.svg|class=skin-invert-image|20px|Waw]]
| fam3 = [[File:PhoenicianW-01.svg|class=skin-invert-image|20px]]
| fam4 = [[Image:Phoenician waw.svg|class=skin-invert-image|20px|Waw]]
| fam5 = [[Image:Early Aramaic character - vav.svg|class=skin-invert-image|20px|Waw]]
| fam6 = {{script|Grek|[[Upsilon|Υ υ]]}}
| fam7 = [[𐌖]]
| fam8 = [[V]]
| usageperiod = 1386 to present
| children = {{hlist
  | [[W]]
  | [[ᴝ]]
  | {{ill|ꭎ|fr|Transcription de Bremer#Voyelles}}
  | [[∪]]
  | [[∩]]
  }}
| sisters = {{hlist
  | [[F]]
  | [[W]]
  | [[Ѵ]]
  | [[У]]
  | [[Ў]]
  | [[Ұ]]
  | [[Ү]]
  | [[Waw (letter)|ו]]
  | [[Waw (letter)|و]]
  | [[Waw (letter)|ܘ]]
  | [[וּ]]
  | [[וֹ]]
  | [[ࠅ]]
  | [[𐎆]]
  | [[𐡅]]
  | [[ወ]]
  | [[વ]]
  | [[ૂ]] [[ુ]]
  | [[उ]]
  }}
| associates = {{hlist
  | [[List of Latin-script digraphs#U|u(x)]]
  | [[Qu (digraph)|qu]]
  }}
| direction = [[Left-to-right]]
| image = File:Latin_letter_U.svg
| imageclass = skin-invert-image
}}
{{Latin letter info|u}}
'''U''', or '''u''', is the twenty-first [[letter (alphabet)|letter]] and the fifth [[vowel letter]] of the [[Latin alphabet]], used in the modern [[English alphabet]] and the alphabets of other western European languages and others worldwide. Its [[English alphabet#Letter names|name in English]] is ''u'' (pronounced {{IPAc-en|'|j|uː|audio=LL-Q1860 (eng)-Flame, not lame-U.wav}}), plural ''ues''.<ref>{{cite OED2|U}}</ref><ref>{{cite book |title=Merriam-Webster's Third New International Dictionary of the English Language, Unabridged |date=1993}}</ref>{{fcn|date=March 2025}}<ref>{{cite book |last1=Brown |first1=Goold |author-link1=Goold Brown |last2=Kiddle |first2=Henry |author-link2=Henry Kiddle |date=1870 |title=The institutes of English grammar |page=19 |publisher=New York, W. Wood & co. |url=https://archive.org/details/institutesofen00bro/page/19}}</ref>{{efn|''Ues'' is the plural of the name of the letter; the plural of the letter itself is rendered ''U's'', ''Us'', ''u's'', or ''us''.}}

== Name ==
In English, the name of the letter is the "long U" sound, pronounced {{IPAc-en|'|j|uː}}. In most other languages, its name matches the letter's pronunciation in [[open syllable]]s.
[[File:Pronunciation of the name of the letter (u) in European languages.png|thumb|Pronunciation of the name of the letter {{angbr|u}} in European languages|305x305px|center]]

== History ==
{{refimprove section |date=July 2023}}
{| class="wikitable" style="text-align: center;"
|-
! Proto-Sinaitic
! Phoenician<br />[[Waw (letter)|Waw]]
! Western Greek<br />[[Upsilon]]
! Latin<br />V
! Latin<br />U
|-
| [[File:Proto-semiticW-01.png|class=skin-invert-image|40px]]
| [[File:PhoenicianW-01.svg|class=skin-invert-image|frameless|40x40px]]
| [[File:Greek Upsilon normal.svg|class=skin-invert-image|40px]]
| [[File:Capitalis monumentalis V.SVG|class=skin-invert-image|x30px]]
| [[File:Capitalis monumentalis U.SVG|class=skin-invert-image|x30px]]
|}
U derives from the Semitic [[waw (letter)|waw]], as does [[F]], and later, [[Y]], [[W]], and [[V]]. Its oldest ancestor goes back to [[Egyptian hieroglyphs]], and is probably from a hieroglyph of a mace or [[fowl]], representing the sound {{IPAblink|v}} or the sound {{IPAblink|w}}. This was borrowed to Phoenician, where it represented the sound {{IPAblink|w}}, and seldom the vowel {{IPAblink|u}}.

In [[Greek language|Greek]], two letters were adapted from the Phoenician waw. The letter was adapted, but split in two, with [[Digamma]] or wau {{angbr|{{script|Grek|Ϝ}}}} being adapted to represent {{IPAblink|w}}, and the second one being [[Upsilon]] {{angbr|{{script|Grek|Υ}}}}, which was originally adapted to represent {{IPAblink|u}}, later fronted, becoming {{IPAblink|y}}.

In [[Latin]], a stemless variant shape of the upsilon was borrowed in early times as U, taking the form of modern-day [[V]]{{snd}}either directly from the [[Western Greek alphabet]] or from the [[Etruscan alphabet]] as an intermediary{{snd}}to represent the same {{IPAslink|u}} sound, as well as the consonantal {{IPAslink|w}}, ''num''{{snd}}originally spelled ''<small>NVM</small>''{{snd}}was pronounced {{IPA|/num/}} and ''via'' was pronounced {{IPA|la|ˈwia|}}. From the 1st century AD on, depending on [[Vulgar Latin]] dialect, consonantal {{IPAslink|w}} developed into {{IPAslink|β}} (kept in [[Spanish language|Spanish]]), then later to {{IPAslink|v}}.

During the late [[Middle Ages]], two minuscule forms developed, which were both used for {{IPAslink|v}} or the vowel {{IPAslink|u}}. The pointed form {{angbr|v}} was written at the beginning of a word, while a rounded form {{angbr|u}} was used in the middle or end, regardless of sound. So whereas 'valour' and 'excuse' appeared as in modern printing, 'have' and 'upon' were printed 'haue' and 'vpon', respectively. The first recorded use of {{angbr|u}} and {{angbr|v}} as distinct letters is in a Gothic alphabet from 1386, where {{angbr|v}} preceded {{angbr|u}}. Printers eschewed capital {{angbr|U}} in favor of {{angbr|V}} into the 17th century and the distinction between the two letters was not fully accepted by the French Academy until 1762.<ref>cf. "U," in ''Dictionnaire de l'Académie Françoise'', 4th ed., 2: 893. 2 vols. Paris: Chez la Veuve de Bernard Brunet, Imprimeur de l'Académie Françoiſe, 1762. https://gallica.bnf.fr/ark:/12148/bpt6k12803850/f901.item; and "U," in ''Dictionnaire de l'Académie Françoise'', 4th ed., 2: 893. 2 vols. Paris: Chez la Veuve de Bernard Brunet, Imprimeur de l'Académie Françoiſe, 1762. https://gallica.bnf.fr/ark:/12148/bpt6k12803850/f901.item.</ref><ref>{{cite book |last=Pflughaupt |first=Laurent |url=https://archive.org/details/letterbyletteral0000pflu |title=Letter by Letter: An Alphabetical Miscellany |publisher=[[Princeton Architectural Press]] |translator-first=Gregory |translator-last=Bruhn |date=2008 |isbn=978-1-56898-737-8 |pages=123–124 |access-date=2009-06-21 |url-access=registration}}</ref>{{better source needed|reason=The cited source does not identify the 1386 manuscript nor does it include a list of references.|date=June 2023}} The rounded variant became the modern-day version of U and its former pointed form became [[V]].

== Use in writing systems ==
{{refimprove section |date=July 2023}}
{| class="wikitable mw-collapsible"
|+ Pronunciation of {{angbr|u}} by language
! Orthography
! Phonemes
|-
! [[Afrikaans alphabet|Afrikaans]]
| {{IPAslink|y}}
|-
! {{nwr|[[Standard Chinese]]}}<ref name=":0">{{cite web |last=Odinye |first=Sunny Ifeanyi |date=January 2015 |title=Phonology of Mandarin Chinese: Pinyin vs. IPA |url=https://www.researchgate.net/publication/305639269 |access-date=2021-05-17 |website=[[ResearchGate]]}}</ref> ([[pinyin]])
| {{IPAslink|u}}, {{IPAslink|y}}
|-
! [[Danish orthography|Danish]]
| {{IPAslink|u}}, {{IPAslink|ʊ}}
|-
! [[Dutch orthography|Dutch]]
| {{IPAslink|y}}, {{IPAslink|œ}}
|-
! [[English orthography|English]]
|{{IPAslink|ʌ}}, {{IPA|/juː/}}, {{IPAslink|uː}}, {{IPAslink|ʊ}}, {{IPAslink|ɜː}}, {{IPA|/jʊə/}}, {{IPA|/ʊə/}}, {{IPAslink|w}}, ''silent''
|-
! [[Esperanto orthography|Esperanto]]
| {{IPAslink|u}}
|-
! [[Faroese orthography|Faroese]]
| {{IPAslink|u}}, {{IPAslink|ʊ}}
|-
! [[French orthography|French]]
| {{IPAslink|y}}, {{IPAslink|ɥ}}
|-
! [[German orthography|German]]
| {{IPAslink|u}}, {{IPAslink|ʊ}}
|-
! [[Icelandic orthography|Icelandic]]
| {{IPAslink|u}}, {{IPAslink|ʏ}}
|-
! [[Indonesian orthography|Indonesian]]<ref>{{cite web |title=Indonesian Alphabet and Pronunciation |url=http://mylanguages.org/indonesian_alphabet.php |access-date=2021-05-17 |archive-date=2021-05-08 |archive-url=https://web.archive.org/web/20210508102904/https://mylanguages.org/indonesian_alphabet.php |url-status=live}}</ref>
| {{IPAslink|u}}
|-
! [[Italian orthography|Italian]]
| {{IPAslink|u}}, {{IPAslink|w}}
|-
! [[Japanese orthography|Japanese]] ([[Hepburn romanization|Hepburn]])
| {{IPAslink|ɯ}}, ''silent''
|-
! [[Lithuanian orthography|Lithuanian]]
|{{IPAslink|ʊ}}
|-
! [[Low German]]
| {{IPAslink|u}}, {{IPAslink|ʊ}}
|-
! [[Malaysian orthography|Malay]]
| {{IPAslink|u}}, {{IPAslink|w}}
|-
! [[Norwegian orthography|Norwegian]]
| {{IPAslink|ʉ}}, {{IPAslink|ɵ}}
|-
! [[Portuguese orthography|Portuguese]]
| {{IPAslink|u}}, {{IPAslink|w}}
|-
! [[Spanish orthography|Spanish]]
| {{IPAslink|u}}, {{IPAslink|w}}
|-
! [[Swedish orthography|Swedish]]
| {{IPAslink|ʉ}}, {{IPAslink|ɵ}}
|-
! [[Turkish alphabet|Turkish]]
| {{IPAslink|u}}
|-
! [[Welsh orthography|Welsh]]
|{{IPAslink|ɨ̞}}, {{IPAslink|ɨː}} or {{IPAslink|ɪ}}, {{IPAslink|iː}}
|}

=== English ===
In [[English language|English]], the letter {{angle brackets|u}} has four main pronunciations. There are "long" and "short" pronunciations. Short {{angbr|u}}, found originally in closed syllables, most commonly represents {{IPAslink|ʌ}} (as in 'duck'), though it retains its old pronunciation {{IPAslink|ʊ}} after [[labial consonant]]s in some words (as in 'put') and occasionally elsewhere (as in 'sugar'). Long {{angbr|u}}, found originally in words of French origin (the descendant of Old English long {{angbr|u}} was respelled as {{angbr|[[ou (digraph)|ou]]}}), most commonly represents {{IPAc-en|j|uː}} (as in 'mule'), reducing to {{IPAslink|uː}} after {{angbr|r}} (as in 'rule'), {{angbr|j}} (as in 'June') and sometimes (or optionally) after {{angbr|l}} (as in 'lute'), and after additional consonants in American English (a [[do–dew merger]]). (After {{angbr|s}}, {{IPA|/sjuː, zjuː/}} have assimilated to {{IPA|/ʃuː, ʒuː/}} in some words.)

The letter {{angbr|u}} is used in the digraphs {{angbr|au}} {{IPAslink|ɔː}}, {{angbr|ou}} (various pronunciations, but usually {{IPA|/aʊ/}}), and with the value of long {{angbr|u}} in {{angbr|eu}}, {{angbr|ue}}, and in a few words {{angbr|ui}} (as in 'fruit'). It often has the sound {{IPAslink|w}} before a vowel in the sequences {{angbr|qu}} (as in 'quick'), {{angbr|gu}} (as in 'anguish'), and {{angbr|su}} (as in 'suave'), though it is silent in final {{angbr|que}} (as in 'unique') and in many words with {{angbr|gu}} (as in 'guard').

Additionally, the letter {{angbr|u}} is used in [[text messaging]], the [[Internet slang|Internet]], and other written slang to denote 'you', by virtue of both being pronounced {{IPAc-en|j|uː}}.

Certain varieties of the English language (i.e. [[British English]], [[Canadian English]], etc.) use the letter U in words such as ''colour'', ''labour'', ''valour'', etc. In [[American English]], the letter is not used, and the words mentioned are spelled as ''color'' and so on.

It is the thirteenth most frequently used letter in the English language,{{When|date=May 2024|reason=Datas may change.}} with a frequency of about 2.8% in words.<ref>{{Cite web |title=Frequency Table |url=https://pi.math.cornell.edu/~mec/2003-2004/cryptography/subs/frequencies.html |access-date=2025-05-08 |website=pi.math.cornell.edu}}</ref>

=== Other languages ===
In most languages that use the Latin alphabet, {{angbr|u}} represents the [[close back rounded vowel]] {{IPAslink|u}} or a similar vowel.<ref>{{cite web |title=Latin |url=http://www.ancientscripts.com/latin.html |archive-url=https://web.archive.org/web/20170611064919/http://www.ancientscripts.com/latin.html |archive-date=Jun 11, 2017 |access-date=2017-06-08 |website=Ancient Scripts}}</ref>
* In [[French orthography]] the letter represents the [[close front rounded vowel]] {{IPAslink|y}}; {{IPAslink|u}} is represented by {{angbr|ou}}.
* In [[Dutch orthography#Sound to spelling correspondences|Dutch]] and [[Afrikaans#Orthography|Afrikaans]], it represents either {{IPAslink|y}}, or a near-close near-front rounded vowel {{IPAslink|ʏ}}; likewise, the phoneme {{IPAslink|u}} is represented by {{angbr|oe}}.
* In [[Welsh orthography]] the letter can represent a long [[close front unrounded vowel]] {{IPAslink|iː}} or short [[near-close near-front unrounded vowel]] {{IPAslink|ɪ}} in Southern dialects. In Northern dialects, the corresponding long and short vowels are a long [[close central unrounded vowel]] {{IPAslink|ɨː}} and a short lowered close central unrounded vowel {{IPAslink|ɨ̞}}, respectively. {{IPAslink|uː}} and {{IPAslink|ʊ}} are represented by {{angbr|w}}.

=== Other systems ===
The [[International Phonetic Alphabet]] uses {{angbr IPA|u}} for the [[close back rounded vowel]].

== Other uses ==
{{main|U (disambiguation)}}
* The symbol 'U' is the chemical symbol for [[uranium]].
* In the context of [[Newton's laws of motion|Newtonian mechanics]], 'U' is the symbol for the [[potential energy]] of a system.
* 'u' is the symbol for the [[unified atomic mass unit]], and 'U' is the symbol for one [[enzyme unit]].
* In the [[International Phonetic Alphabet]], the [[close back rounded vowel]] is represented by the lowercase {{angbr|u}}.
* 'U' is also the source of the mathematical symbol ∪, representing a [[union (set theory)|union]]. It is used mainly for [[Venn diagram]]s and [[geometry]].
* It is used for ''micro-'' in metric measurements as a replacement for the Greek letter [[μ]] (mu), of which it is a graphic approximation when that Greek letter is not available, as in "<code>um</code>" for [[μm]] (micrometer).
* Some universities, such as the [[University of Miami]] and the [[University of Utah]], are locally known as "The U".
* 'U' (or sometimes RU) is a standard height unit of measure in [[rack unit]]s, with each U equal to {{convert|44.50|mm|in|2}}.
* 'U' is used as the symbol of the World War II organization [[Ustaše]].
* '''U''' is an honorific in Burmese.<ref>{{cite news |url=https://www.frontiermyanmar.net/en/the-meaning-behind-myanmar-names/ |title=The meaning behind Myanmar names |work=Frontier Myanmar |first=Sharon |last=Pun |date=2018-08-04 |access-date=2021-02-09 |archive-date=2021-02-14 |archive-url=https://web.archive.org/web/20210214114737/https://www.frontiermyanmar.net/en/the-meaning-behind-myanmar-names/ |url-status=live}}</ref>

== Related characters ==
<!-- Please only list characters (symbols in a writing system, but not just convenience code points in Unicode) that are actually related in terms of origin to the letter that is the topic of this article. Characters that merely look subjectively similar need not apply. See https://en.wikipedia.org/wiki/Wikipedia:Verifiability and https://en.wikipedia.org/wiki/Wikipedia:Identifying_reliable_sources before adding more. -->

=== Ancestors, descendants and siblings ===
* {{angbr|{{script|Phnx|𐤅}}}}: [[Phoenician alphabet|Semitic]] letter [[Waw (letter)|Waw]], from which the following symbols originally derive:
** {{angbr|{{script|Grek|Υ υ}}}}: [[Greek alphabet|Greek]] letter [[Upsilon]], from which U derives
*** {{angbr|V v}}: Latin letter [[V]], descended from U
**** {{angbr|W w}}: Latin letter [[W]], descended from V/U
*** {{angbr|Y y}}: Latin letter [[Y]], also descended from Upsilon
*** {{angbr|{{script|Cyrl|У у}}}}: [[Cyrillic]] letter [[U (Cyrillic)|U]], which also derives from Upsilon
*** {{angbr|{{script|Cyrl|Ү ү}}}}: Cyrillic letter [[Ue (Cyrillic)|Ue]]
** {{angbr|{{script|Grek|Ϝ ϝ}}}}: [[Greek alphabet|Greek]] letter [[Digamma]]
*** {{angbr|F f}}: Latin letter [[F]], derived from Digamma
* [[International Phonetic Alphabet|IPA]]-specific symbols related to U: {{IPAalink|ʊ}} {{IPAalink|ɥ}}
* [[Uralic Phonetic Alphabet]]-specific symbols related to U:<ref>{{cite web |url=https://www.unicode.org/L2/L2002/02141-n2419-uralic-phonetic.pdf |title=L2/02-141: Uralic Phonetic Alphabet characters for the UCS |date=2002-03-20 |first=Michael |last=Everson |author-link=Michael Everson |access-date=2018-03-24 |archive-date=2018-02-19 |archive-url=https://web.archive.org/web/20180219081033/http://www.unicode.org/L2/L2002/02141-n2419-uralic-phonetic.pdf |url-status=live}}</ref>
** {{unichar|1D1C|LATIN LETTER SMALL CAPITAL U}}
** {{unichar|1D41|MODIFIER LETTER CAPITAL U}}
** {{unichar|1D58|MODIFIER LETTER SMALL U}}
** {{unichar|1D64|LATIN SUBSCRIPT SMALL LETTER U}}
** {{unichar|1D1D|LATIN SMALL LETTER SIDEWAYS U}}
** {{unichar|1D1E|LATIN SMALL LETTER SIDEWAYS DIAERESIZED U}}
** {{unichar|1D59|MODIFIER LETTER SMALL SIDEWAYS U}}
* [[Teuthonista]] phonetic transcription-specific symbols related to U:<ref>{{cite web |url=https://www.unicode.org/L2/L2011/11202-n4081-teuthonista.pdf |title=L2/11-202: Revised proposal to encode "Teuthonista" phonetic characters in the UCS |date=2011-06-02 |first1=Michael |last1=Everson |author-link1=Michael Everson |first2=Alois |last2=Dicklberger |first3=Karl |last3=Pentzlin |first4=Eveline |last4=Wandl-Vogt |access-date=2018-03-24 |archive-date=2017-10-11 |archive-url=https://web.archive.org/web/20171011012426/http://www.unicode.org/L2/L2011/11202-n4081-teuthonista.pdf |url-status=live}}</ref>
** {{unichar|AB4E|LATIN SMALL LETTER U WITH SHORT RIGHT LEG}}
** {{unichar|AB4F|LATIN SMALL LETTER U BAR WITH SHORT RIGHT LEG}}
** {{unichar|AB51|LATIN SMALL LETTER TURNED UI}}
** {{unichar|AB52|LATIN SMALL LETTER U WITH LEFT HOOK}}
** {{unichar|AB5F|MODIFIER LETTER SMALL U WITH LEFT HOOK}}
* {{unichar|1DB8|Modifier Letter Small Capital U}}: used for phonetic transcription<ref name="L204132"/>
* {{angbr|Ꞿ ꞿ}}: Glottal U, used in the transliteration of [[Ugaritic]]<ref>{{Cite web|url=https://www.unicode.org/L2/L2017/17076r2-n4792r2-egyptological-yod.pdf|title=L2/17-076R2: Revised proposal for the encoding of an Egyptological YOD and Ugaritic characters|date=2017-05-09|first=Michel|last=Suignard|access-date=2019-03-08|archive-date=2019-03-30|archive-url=https://web.archive.org/web/20190330043926/https://www.unicode.org/L2/L2017/17076r2-n4792r2-egyptological-yod.pdf|url-status=live}}</ref>
* U with [[diacritic]]s: {{angbr|[[Ŭ|Ŭ ŭ]] [[Ʉ|Ʉ ʉ]] ᵾ}}<ref name="L204132">{{cite web |url=https://www.unicode.org/L2/L2004/04132-n2740-phonetic.pdf |title=L2/04-132 Proposal to add additional phonetic characters to the UCS |date=2004-04-19 |first=Peter|last=Constable |access-date=2018-03-24 |archive-date=2017-10-11 |archive-url=https://web.archive.org/web/20171011014355/http://www.unicode.org/L2/L2004/04132-n2740-phonetic.pdf |url-status=live}}</ref> {{angbr|ᶶ}}<ref name="L204132"/> {{angbr|Ꞹ}}<ref name="L216032">{{cite web|title=L2/16-032: Proposal to encode two Latin characters for Mazahua |url=https://www.unicode.org/L2/L2016/16032-latin-mazahua.pdf |date=2016-01-22 |first=Denis |last=Jacquerye |access-date=2018-06-19 |archive-date=2019-03-30 |archive-url=https://web.archive.org/web/20190330042902/https://www.unicode.org/L2/L2016/16032-latin-mazahua.pdf |url-status=live}}</ref> {{angbr|ꞹ}}<ref name="L216032"/> {{angbr|[[Dot (diacritic)|Ụ ụ]]}} {{angbr|[[Ü|Ü ü]]}} {{angbr|Ǜ ǜ}} {{angbr|Ǘ ǘ}} {{angbr|Ǚ ǚ}} {{angbr|Ǖ ǖ}} {{angbr|Ṳ ṳ}} {{angbr|[[Ú|Ú ú]]}} {{angbr|[[Ù|Ù ù]]}} {{angbr|[[Circumflex|Û û Ṷ ṷ]]}} {{angbr|[[Caron|Ǔ ǔ]]}} {{angbr|[[Ȗ|Ȗ ȗ]]}} {{angbr|[[Double acute accent|Ű ű]]}} {{angbr|[[Ŭ|Ŭ ŭ]]}} {{angbr|[[Ư|Ư ư]]}} {{angbr|Ứ ứ}} {{angbr|Ừ ừ}} {{angbr|Ử ử}} {{angbr|Ự ự}} {{angbr|Ữ Ữ}} {{angbr|[[Hook above|Ủ ủ]]}} {{angbr|[[Macron (diacritic)|Ū ū]]}} {{angbr|Ū̀ ū̀}} {{angbr|Ū́ ū́}} {{angbr|Ṻ ṻ}} {{angbr|Ū̃ ū̃}} {{angbr|[[Tilde|Ũ ũ]]}} {{angbr|Ṹ ṹ}} {{angbr|Ṵ ṵ}} {{angbr|[[Hook (diacritic)|ᶙ]]}}<ref name="L204132"/> {{angbr|[[Ogonek|Ų ų Ų́ ų́ Ų̃ ų̃]]}} {{angbr|[[Double grave accent|Ȕ ȕ]]}} {{angbr|[[Ring (diacritic)|Ů ů]]}}
** {{unichar|A7B8|LATIN CAPITAL LETTER U WITH STROKE}} and {{unichar|A7B9|LATIN SMALL LETTER U WITH STROKE}} are used in the [[Mazahua language]] and feature a [[Bar (diacritic)|bar diacritic]].

=== Ligatures and abbreviations ===
* {{char|∪}}: [[Union (set theory)|Union]], an [[infix notation]].
* {{char|∩}}: [[Intersection (set theory)|Intersection]], an infix notation.

== Other representations ==
=== Computing <span class="anchor" id="Computing codes"></span><span class="anchor" id="Codes for computing"></span> ===
* {{unichar| 0055}}
* {{unichar| 0075}}
* {{unichar| FF35 |nlink=Half-width and full-width forms}}
* {{unichar| FF55}}

=== Other ===
{{letter other reps
| NATO = Uniform
| Morse = ..-
| Character = U
| Braille = ⠥
| fingerspelling = U
}}

== Notes ==
{{notelist}}

== References ==
{{reflist}}

== External links ==
* {{Commons-inline|U}}
* {{Wiktionary-inline|U}}
* {{Wiktionary-inline|u}}

{{Latin script|U|}}

[[Category:Vowel letters]]
[[Category:ISO basic Latin letters]]