U

U
U
U u
((See below))
Usage
Writing system	Latin script
Type	Alphabetic and Logographic
Language of origin	Latin language
Sound values	[u]; [w]; [ʉ]; [y]; [ʏ]; [h]; [ʊ]; [iː]; [ɨː]; [ʌ]; [ɛ]; /juː/
In Unicode	U+0055, U+0075
Alphabetical position	21
History
Development	Υ υ 𐌖 Y V U u; ; ; ; ; ; ; ; ;
Time period	1386 to present
Descendants	• W; • ᴝ; • ꭎ; • ∪; • ∩
Sisters	F; W; Ѵ; У; Ў; Ұ; Ү; ו; و; ܘ; וּ; וֹ; ࠅ; 𐎆; 𐡅; ወ; વ; ૂ ુ; उ
Variations	((See below))
Other
Associated graphs	u(x), qu
Writing direction	Left-to-Right
	This article contains phonetic transcriptions in the International Phonetic Alphabet (IPA). For an introductory guide on IPA symbols, see Help:IPA. For the distinction between [ ], / / and ⟨ ⟩, see IPA § Brackets and transcription delimiters.

U or u is the 21st and sixth-to-last letter of the ISO basic Latin alphabet and the fifth vowel letter of the modern English alphabet. Its name in English is u (pronounced /ˈjuː/), plural ues.^[1]^[2]

History

The letter u ultimately comes from the Phoenician letter waw by way of the letter y. See the letter y for details.

During the late Middle Ages, two forms of 'v' developed, which were both used for its ancestor 'u' and modern 'v'. The pointed form 'v' was written at the beginning of a word, while a rounded form 'u' was used in the middle or end, regardless of sound. So whereas 'through' and 'excuse' appeared as in modern printing, 'have' and 'upon' were printed 'haue' and 'vpon', respectively. The first recorded use of 'u' and 'v' as distinct letters is in a Gothic alphabet from 1386, where 'v' preceded 'u'. Printers eschewed capital 'U' into the 17th century and the distinction between the two letters was not fully accepted by the French Academy until 1762.^[3]

Pronunciation and use

Pronunciations of Uu
Most common pronunciation: /u/ Languages in italics do not use the Latin alphabet; the table refers to latinizations
Language	Dialect(s)	Pronuncaition (IPA)	Environment	Notes
Afrikaans		/y/
Danish		/u/	Usually
Danish		/ʊ/	Before two consonants
Dutch		/œ/	Before two consonants
Dutch		/y/	Usually
English		/ɛ/	In "bury" and "burial"
		/ɪ/	In "busy" and "business"
		(j)u	Stressed and not before a consonant
		/ʊ/	Sometimes
		/ʌ/	Usually
		/w/	After g or q and before a vowel
		silent	After g or q and before a vowel in some words
Faroese		/ʊ/	Before two consonants
Faroese		/u/	Usually
French		/y/	Usually
French		/ɥ/	Before vowels
German		/ʊ/	Before two consonants
German		/u/	Usually
Icelandic		/u/	Usually
Icelandic		/ʏ/	Before two consonants
Italian		/u/	Usually
Italian		/w/	Before vowels
Japanese		/ɯ/	Usually
Japanese		silent	Unstressed, between two consonants
Lithuanian		/ʊ/
Low German		/ʊ/	Before two consonants
Low German		/u/	Usually
Norwegian		/ɵ/	Before two consonants
Norwegian		/ʉ/	Usually
Portuguese		/u/	Usually
Portuguese		/w/	Before vowels
Spanish		/u/	Usually
Spanish		/w/	Before vowels
Swedish		/ɵ/	Before two consonants
Swedish		/ʉ/	Usually
Welsh	Northern dialects	/ɨ/
Welsh	Southern dialects	/ɪ/

English

In English, the letter ⟨u⟩ has four main pronunciations. There are "long" and "short" pronunciations. Short ⟨u⟩, found originally in closed syllables, most commonly represents /ʌ/ (as in 'duck'), though it retains its old pronunciation /ʊ/ after labial consonants in some words (as in 'put') and occasionally elsewhere (as in 'sugar'). Long ⟨u⟩, found originally in words of French origin (the descendant of Old English long u was respelled as ⟨ou⟩), most commonly represents /juː/ (as in 'mule'), reducing to /uː/ after ⟨r⟩ (as in 'rule'), ⟨j⟩ (as in 'June') and sometimes (or optionally) after ⟨l⟩ (as in 'lute'), and after additional consonants in American English (see do–dew merger). (After ⟨s⟩, /sjuː, zjuː/ have assimilated to /ʃuː, ʒuː/.) In a few words, short ⟨u⟩ represents other sounds, such as /ɪ/ in 'business' and /ɛ/ in 'bury'.

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

Additionally, the letter ⟨u⟩ is used in text messaging and internet and other written slang to denote 'you', by virtue of both being pronounced /juː/.

One thing to note is that 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.; however, in American English the letter is not used and said words mentioned are spelled as color and so on.

Other languages

In most languages that use the Latin alphabet, ⟨u⟩ represents the close back rounded vowel /u/ or a similar vowel.^[4]

In French orthography the letter represents the close front rounded vowel (/y/); /u/ is represented by ⟨ou⟩. In Dutch and Afrikaans, it represents either /y/, or a near-close near-front rounded vowel (/ʏ/); likewise the phoneme /u/ is represented by ⟨oe⟩. In Welsh orthography the letter can represent a long close front unrounded vowel (/iː/) or short near-close near-front unrounded vowel (/ɪ/) in Southern dialects. In Northern dialects, the corresponding long and short vowels are a long close central unrounded vowel (/ɨː/) and a short lowered close central unrounded vowel (/ɨ̞/), respectively. /uː/ and /ʊ/ are represented by ⟨w⟩.

Other uses

The symbol 'U' is the chemical symbol for uranium.

In the context of Newtonian mechanics 'U' is the symbol for the potential energy of a system.

'u' is the symbol for the atomic mass unit and 'U' is the symbol for one Enzyme unit.

In IPA, the close back rounded vowel is represented by the lower case ⟨u⟩.

U is also the source of the mathematical symbol ∪, representing a union. It is used mainly for Venn diagrams and geometry.

It is used as 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 "um" 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 units, with each U equal to 44.50 millimetres (1.75 in).

Related characters

Ancestors, descendants and siblings

𐤅: Semitic letter Waw, from which the following symbols originally derive
- Υ υ : Greek letter Upsilon, from which U derives
  - V v : Latin letter V, from which U is directly descended
    - W w : Latin letter W, which, like U, is descended from V
  - Y y : Latin letter Y, also descended from Upsilon
  - У у : Cyrillic letter U, which also derives from Upsilon
  - Ү ү : Cyrillic letter Ue
- Ϝ ϝ : Greek letter Digamma
  - F f : Latin letter F, derived from Digamma
IPA-specific symbols related to U: ʊ^{[citation needed]} ɥ
Uralic Phonetic Alphabet-specific symbols related to U:^[5]
- U+1D1C ᴜ LATIN LETTER SMALL CAPITAL U
- U+1D41 ᵁ MODIFIER LETTER CAPITAL U
- U+1D58 ᵘ MODIFIER LETTER SMALL U
- U+1D64 ᵤ LATIN SUBSCRIPT SMALL LETTER U
- U+1D1D ᴝ LATIN SMALL LETTER SIDEWAYS U
- U+1D1E ᴞ LATIN SMALL LETTER SIDEWAYS DIAERESIZED U
- U+1D59 ᵙ MODIFIER LETTER SMALL SIDEWAYS U
Teuthonista phonetic transcription-specific symbols related to U:^[6]
- U+AB4E ꭎ LATIN SMALL LETTER U WITH SHORT RIGHT LEG
- U+AB4F ꭏ LATIN SMALL LETTER U BAR WITH SHORT RIGHT LEG
- U+AB51 ꭑ LATIN SMALL LETTER TURNED UI
- U+AB52 ꭒ LATIN SMALL LETTER U WITH LEFT HOOK
- U+AB5F ꭟ MODIFIER LETTER SMALL U WITH LEFT HOOK
ᶸ : Modifier letter small capital u is used for phonetic transcription^[7]
Ꞿ ꞿ : Glottal U, used in the transliteration of Ugaritic^[8]
U with diacritics: Ŭ ŭ Ʉ ʉ ᵾ^[7] ᶶ^[7] Ꞹ^[9] ꞹ^[9] Ụ ụ Ü ü Ǜ ǜ Ǘ ǘ Ǚ ǚ Ǖ ǖ Ṳ ṳ Ú ú Ù ù Û û Ṷ ṷ Ǔ ǔ Ȗ ȗ Ű ű Ŭ ŭ Ư ư Ứ ứ Ừ ừ Ử ử Ự ự Ữ Ữ Ủ ủ Ū ū Ū̀ ū̀ Ū́ ū́ Ṻ ṻ Ū̃ ū̃ Ũ ũ Ṹ ṹ Ṵ ṵ ᶙ^[7] Ų ų Ų́ ų́ Ų̃ ų̃ Ȕ ȕ Ů ů
- U+A7B8 Ꞹ LATIN CAPITAL LETTER U WITH STROKE and U+A7B9 ꞹ LATIN SMALL LETTER U WITH STROKE are used in the Mazahua language and feature a bar diacritic

Ligatures and abbreviations

∪ : Union
∩ : Intersection, an upside-down upper case "U"^{[citation needed]}

Computing codes

Character information
Preview	U		u
Unicode name	LATIN CAPITAL LETTER U		LATIN SMALL LETTER U
Encodings	decimal	hex	dec	hex
Unicode	85	U+0055	117	U+0075
UTF-8	85	55	117	75
Numeric character reference	U	U	u	u
EBCDIC family	228	E4	164	A4
ASCII ¹	85	55	117	75

¹ Also for encodings based on ASCII, including the DOS, Windows, ISO-8859 and Macintosh families of encodings.

Other representations

NATO phonetic	Morse code
Uniform	▄▄▄ ^ⓘ


Signal flag	Flag semaphore	American manual alphabet (ASL fingerspelling)	British manual alphabet (BSL fingerspelling)	Braille dots-136 Unified English Braille

References

^ "U", Oxford English Dictionary, 2nd edition (1989); Merriam-Webster's Third New International Dictionary of the English Language, Unabridged (1993)
^ Brown & Kiddle (1870) The institutes of English grammar, page 19.
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.
^ Pflughaupt, Laurent (2008). Letter by Letter: An Alphabetical Miscellany. trans. Gregory Bruhn. Princeton Architectural Press. pp. 123–124. ISBN 978-1-56898-737-8. Retrieved 2009-06-21.
^ "Ancient Scripts: Latin". www.ancientscripts.com. Retrieved 2017-06-08.
^ Everson, Michael; et al. (2002-03-20). "L2/02-141: Uralic Phonetic Alphabet characters for the UCS" (PDF).
^ Everson, Michael; Dicklberger, Alois; Pentzlin, Karl; Wandl-Vogt, Eveline (2011-06-02). "L2/11-202: Revised proposal to encode "Teuthonista" phonetic characters in the UCS" (PDF).
^ ^a ^b ^c ^d Constable, Peter (2004-04-19). "L2/04-132 Proposal to add additional phonetic characters to the UCS" (PDF).
^ Suignard, Michel (2017-05-09). "L2/17-076R2: Revised proposal for the encoding of an Egyptological YOD and Ugaritic characters" (PDF).
^ ^a ^b Jacquerye, Denis (2016-01-22), L2/16-032: Proposal to encode two Latin characters for Mazahua (PDF)

External links

Media related to U at Wikimedia Commons
The dictionary definition of U at Wiktionary
The dictionary definition of u at Wiktionary

[1] "U", Oxford English Dictionary, 2nd edition (1989); Merriam-Webster's Third New International Dictionary of the English Language, Unabridged (1993)

[2] Brown & Kiddle (1870) The institutes of English grammar, page 19.
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.

[3] Pflughaupt, Laurent (2008). Letter by Letter: An Alphabetical Miscellany. trans. Gregory Bruhn. Princeton Architectural Press. pp. 123–124. ISBN 978-1-56898-737-8. Retrieved 2009-06-21.

[4] "Ancient Scripts: Latin". www.ancientscripts.com. Retrieved 2017-06-08.

[5] Everson, Michael; et al. (2002-03-20). "L2/02-141: Uralic Phonetic Alphabet characters for the UCS" (PDF).

[6] Everson, Michael; Dicklberger, Alois; Pentzlin, Karl; Wandl-Vogt, Eveline (2011-06-02). "L2/11-202: Revised proposal to encode "Teuthonista" phonetic characters in the UCS" (PDF).

[L204132-7] Constable, Peter (2004-04-19). "L2/04-132 Proposal to add additional phonetic characters to the UCS" (PDF).

[8] Suignard, Michel (2017-05-09). "L2/17-076R2: Revised proposal for the encoding of an Egyptological YOD and Ugaritic characters" (PDF).

[L216032-9] Jacquerye, Denis (2016-01-22), L2/16-032: Proposal to encode two Latin characters for Mazahua (PDF)

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