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U or u, is the twenty-first and sixth-to-last
letter Letter, letters, or literature may refer to: Characters typeface * Letter (alphabet), a character representing one or more of the sounds used in speech; any of the symbols of an alphabet. * Letterform, the graphic form of a letter of the alphabe ...
and fifth
vowel letter A vowel is a syllabic speech sound pronounced without any stricture in the vocal tract. Vowels are one of the two principal classes of speech sounds, the other being the consonant. Vowels vary in quality, in loudness and also in quantity (leng ...
of the
Latin alphabet The Latin alphabet or Roman alphabet is the collection of letters originally used by the ancient Romans to write the Latin language. Largely unaltered with the exception of extensions (such as diacritics), it used to write English and the o ...
, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''u'' (pronounced ), plural ''ues''.


History

U derives from the Semitic
waw Waw or WAW may refer to: * Waw (letter), a letter in many Semitic abjads * Waw, the velomobile * Another spelling for the town Wau, South Sudan * Waw Township, Burma *Warsaw Chopin Airport, an international airport serving Warsaw, Poland (IATA ai ...
, as does F, and later, Y, W, and V. Its oldest ancestor goes to
Egyptian hieroglyphics Egyptian hieroglyphs (, ) were the formal writing system used in Ancient Egypt, used for writing the Egyptian language. Hieroglyphs combined logographic, syllabic and alphabetic elements, with some 1,000 distinct characters.There were about 1,00 ...
, and is probably from a hieroglyph of a mace or fowl, representing the sound v">Voiced_labiodental_fricative.html" ;"title="nowiki/> vor the sound [Voiced labial–velar approximant">w">Voiced labiodental fricative">vor the sound [Voiced labial–velar approximant">w This was borrowed to Phoenician, where it represented the sound [w], and seldom the vowel [Close back rounded vowel, u]. In Greek language, Greek, two letters were adapted from the Phoenician waw. The letter was adapted, but split in two, with the Digamma, first one of the same name (Ϝ) being adapted to represent w.html" ;"title="nowiki/> w">nowiki/> w and the second one being Upsilon (), which was originally adapted to represent u later fronted, becoming [Close front rounded vowel">y">Close back rounded vowel">u later fronted, becoming [Close front rounded vowel">y In Latin, a stemless variant shape of the upsilon was borrowed in early times as U, taking the form of modern-day V — either directly from the
Western Greek alphabet Many local variants of the Greek alphabet were employed in ancient Greece during the archaic and early classical periods, until around 400 BC, when they were replaced by the classical 24-letter alphabet that is the standard today. All forms ...
or from the
Etruscan alphabet The Etruscan alphabet was the alphabet used by the Etruscans, an ancient civilization of central and northern Italy, to write their language, from about 700 BC to sometime around 100 AD. The Etruscan alphabet derives from the Euboean alphabet ...
as an intermediary — to represent the same sound, as well as the consonantal , ''num'' — originally spelled ''NVM'' — was pronounced and ''via'' was pronounced . From the 1st century AD on, depending on
Vulgar Latin Vulgar Latin, also known as Popular or Colloquial Latin, is the range of non-formal Register (sociolinguistics), registers of Latin spoken from the Crisis of the Roman Republic, Late Roman Republic onward. Through time, Vulgar Latin would evolve ...
dialect, consonantal developed into (kept in
Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Cana ...
), then later to . During the late
Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
, two forms of U developed, which were both used for /v/ or the vowel /u/. 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 'valour' 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 'V' and 'U' into the 17th century and the distinction between the two letters was not fully accepted by the French Academy until 1762. The rounded variant became the modern-day version of U and its former pointed form became V.


Pronunciation and use


English

In
English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ide ...
, the letter has four main pronunciations. There are "long" and "short" pronunciations. Short , found originally in closed syllables, most commonly represents (as in 'duck'), though it retains its old pronunciation after
labial consonant Labial consonants are consonants in which one or both lips are the active articulator. The two common labial articulations are bilabials, articulated using both lips, and labiodentals, articulated with the lower lip against the upper teeth, bot ...
s in some words (as in 'put') and occasionally elsewhere (as in 'sugar'). Long , found originally in words of French origin (the descendant of Old English long u was respelled as ), most commonly represents (as in 'mule'), reducing to after (as in 'rule'), (as in 'June') and sometimes (or optionally) after (as in 'lute'), and after additional consonants in American English (see
do–dew merger The phonological history of the English language includes various changes in the phonology of consonant clusters. H-cluster reductions The H-cluster reductions are various Cluster reduction, consonant reductions that have occurred in the histo ...
). (After , have assimilated to in some words) In a few words, short represents other sounds, such as in 'business' and in 'bury'. The letter is used in the digraphs , (various pronunciations, but usually /aʊ/), and with the value of "long u" in , , and in a few words (as in 'fruit'). It often has the sound before a vowel in the sequences (as in 'quick'), (as in 'anguish'), and (as in 'suave'), though it is silent in final ''-que'' (as in 'unique') and in many words with (as in 'guard'). Additionally, the letter is used in
text messaging Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile devices, desktops/laptops, or another type of compatible compute ...
,
Internet The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, pub ...
and other written slang to denote 'you', by virtue of both being pronounced . One thing to note is that certain varieties of the English language (i.e.
British English British English (BrE, en-GB, or BE) is, according to Lexico, Oxford Dictionaries, "English language, English as used in Great Britain, as distinct from that used elsewhere". More narrowly, it can refer specifically to the English language in ...
,
Canadian English Canadian English (CanE, CE, en-CA) encompasses the varieties of English native to Canada. According to the 2016 census, English was the first language of 19.4 million Canadians or 58.1% of the total population; the remainder spoke French ( ...
, etc.) use the letter U in words such as ''colour'', ''labour'', ''valour'', etc.; however, in
American English American English, sometimes called United States English or U.S. English, is the set of variety (linguistics), varieties of the English language native to the United States. English is the Languages of the United States, most widely spoken lan ...
the letter is not used and said words mentioned are spelled as ''color'' and so on. It is the thirteenth most frequently used letter in the English language, with a frequency of about 2.8% in words.


Other languages

In most languages that use the Latin alphabet, represents the
close back rounded vowel The close back rounded vowel, or high back rounded vowel, is a type of vowel sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is u. In ...
or a similar vowel. In
French orthography French orthography encompasses the spelling and punctuation of the French language. It is based on a combination of phoneme, phonemic and historical principles. The spelling of words is largely based on the pronunciation of Old French c. 1100–1 ...
the letter represents the
close front rounded vowel The close front rounded vowel, or high front rounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is /y/, and the equivalent X-SAMPA symbol is y. Acr ...
(); is represented by . In
Dutch Dutch commonly refers to: * Something of, from, or related to the Netherlands * Dutch people () * Dutch language () Dutch may also refer to: Places * Dutch, West Virginia, a community in the United States * Pennsylvania Dutch Country People E ...
and
Afrikaans Afrikaans (, ) is a West Germanic language that evolved in the Dutch Cape Colony from the Dutch vernacular of Holland proper (i.e., the Hollandic dialect) used by Dutch, French, and German settlers and their enslaved people. Afrikaans gra ...
, it represents either , or a near-close near-front rounded vowel (); likewise the phoneme is represented by . In
Welsh orthography Welsh orthography uses 29 letters (including eight digraphs) of the Latin script to write native Welsh words as well as established loanwords. The acute accent (), the grave accent (), the circumflex (, , or ) and the diaeresis mark () are al ...
the letter can represent a long
close front unrounded vowel The close front unrounded vowel, or high front unrounded vowel, is a type of vowel sound that occurs in most spoken languages, represented in the International Phonetic Alphabet by the symbol i. It is similar to the vowel sound in the English wo ...
() or short
near-close near-front unrounded vowel The near-close front unrounded vowel, or near-high front unrounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , i.e. a small capital letter ''i ...
() in Southern dialects. In Northern dialects, the corresponding long and short vowels are a long
close central unrounded vowel The close central unrounded vowel, or high central unrounded vowel, is a type of vowel sound used in some languages. The symbol in the International Phonetic Alphabet that represents this sound is , namely the lower-case letter ''i'' with a hori ...
() and a short lowered close central unrounded vowel (), respectively. and are represented by .


Other uses

The symbol 'U' is the chemical symbol for
uranium Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weak ...
. In the context of Newtonian
mechanics Mechanics (from Ancient Greek: μηχανική, ''mēkhanikḗ'', "of machines") is the area of mathematics and physics concerned with the relationships between force, matter, and motion among physical objects. Forces applied to objects r ...
'U' is the symbol for the
potential energy In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors. Common types of potential energy include the gravitational potentia ...
of a system. 'u' is the symbol for the
atomic mass unit The dalton or unified atomic mass unit (symbols: Da or u) is a non-SI unit of mass widely used in physics and chemistry. It is defined as of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at ...
and 'U' is the symbol for one
Enzyme unit The enzyme unit, or international unit for enzyme (symbol U, sometimes also IU) is a unit of enzyme's catalytic activity. 1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micromole of substrate per mi ...
. In
IPA IPA commonly refers to: * India pale ale, a style of beer * International Phonetic Alphabet, a system of phonetic notation * Isopropyl alcohol, a chemical compound IPA may also refer to: Organizations International * Insolvency Practitioners ...
, the
close back rounded vowel The close back rounded vowel, or high back rounded vowel, is a type of vowel sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is u. In ...
is represented by the lower case ⟨u⟩. U is also the source of the mathematical symbol ∪, representing a
union Union commonly refers to: * Trade union, an organization of workers * Union (set theory), in mathematics, a fundamental operation on sets Union may also refer to: Arts and entertainment Music * Union (band), an American rock group ** ''Un ...
. It is used mainly for
Venn diagram A Venn diagram is a widely used diagram style that shows the logical relation between set (mathematics), sets, popularized by John Venn (1834–1923) in the 1880s. The diagrams are used to teach elementary set theory, and to illustrate simple ...
s and
geometry Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is c ...
. 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 The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Unit ...
(micrometer). Some universities, such as the
University of Miami The University of Miami (UM, UMiami, Miami, U of M, and The U) is a private research university in Coral Gables, Florida. , the university enrolled 19,096 students in 12 colleges and schools across nearly 350 academic majors and programs, incl ...
and the
University of Utah The University of Utah (U of U, UofU, or simply The U) is a public research university in Salt Lake City, Utah. It is the flagship institution of the Utah System of Higher Education. The university was established in 1850 as the University of De ...
, are locally known as "The U". U (or sometimes RU) is a standard height unit of measure in
rack unit A rack unit (abbreviated U or RU) is a unit of measure defined as . It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby th ...
s, with each U equal to . ''U'' is a honorific in Burmese.


Related characters


Ancestors, descendants and siblings

*𐤅: Semitic letter
Waw Waw or WAW may refer to: * Waw (letter), a letter in many Semitic abjads * Waw, the velomobile * Another spelling for the town Wau, South Sudan * Waw Township, Burma *Warsaw Chopin Airport, an international airport serving Warsaw, Poland (IATA ai ...
, from which the following symbols originally derive ** υ :
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
letter
Upsilon Upsilon (, ; uppercase Υ, lowercase υ; el, ''ýpsilon'' ) or ypsilon is the 20th letter of the Greek alphabet. In the system of Greek numerals, grc, Υʹ, label=none has a value of 400. It is derived from the Phoenician waw . Etym ...
, from which U derives ***V v : Latin letter V, descended from U ****W w : Latin letter W, descended frm V/U ***Y y : Latin letter Y, also descended from Upsilon ***У у :
Cyrillic , bg, кирилица , mk, кирилица , russian: кириллица , sr, ћирилица, uk, кирилиця , fam1 = Egyptian hieroglyphs , fam2 = Proto-Sinaitic , fam3 = Phoenician , fam4 = G ...
letter U, which also derives from Upsilon ***Ү ү : Cyrillic letter Ue **Ϝ ϝ :
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
letter
Digamma Digamma or wau (uppercase: Ϝ, lowercase: ϝ, numeral: ϛ) is an archaic letter of the Greek alphabet. It originally stood for the sound but it has remained in use principally as a Greek numeral for 6. Whereas it was originally called ''waw' ...
***F f : Latin letter F, derived from Digamma *
IPA IPA commonly refers to: * India pale ale, a style of beer * International Phonetic Alphabet, a system of phonetic notation * Isopropyl alcohol, a chemical compound IPA may also refer to: Organizations International * Insolvency Practitioners ...
-specific symbols related to U: *
Uralic Phonetic Alphabet The Uralic Phonetic Alphabet (UPA) or Finno-Ugric transcription system is a phonetic transcription or notational system used predominantly for the transcription and reconstruction of Uralic languages. It was first published in 1901 by Eemil Nesto ...
-specific symbols related to U: ** ** ** ** ** ** ** *
Teuthonista Teuthonista is a phonetic transcription system used predominantly for the transcription of (High) German dialects. It is very similar to other Central European transcription systems from the early 20th century. The base characters are mostly bas ...
phonetic transcription-specific symbols related to U: ** ** ** ** ** *ᶸ : Modifier letter small capital u is used for phonetic transcription *Ꞿ ꞿ : Glottal U, used in the transliteration of
Ugaritic Ugaritic () is an extinct Northwest Semitic language, classified by some as a dialect of the Amorite language and so the only known Amorite dialect preserved in writing. It is known through the Ugaritic texts discovered by French archaeologis ...
*U with
diacritic A diacritic (also diacritical mark, diacritical point, diacritical sign, or accent) is a glyph added to a letter or to a basic glyph. The term derives from the Ancient Greek (, "distinguishing"), from (, "to distinguish"). The word ''diacriti ...
s: Ŭ ŭ Ʉ ʉ 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 Ų ų Ų́ ų́ Ų̃ ų̃ Ȕ ȕ Ů ů ** and are used in the
Mazahua language The Mazahua language ( maz, Jñatrjo) is an Oto-Pamean language spoken in the central states of Mexico by the ethnic group that is widely known as the Mazahua but calls itself the Hñatho. It is a Mesoamerican language and has many of the tra ...
and feature a
bar diacritic A bar or stroke is a modification consisting of a line drawn through a grapheme. It may be used as a diacritic to derive new letters from old ones, or simply as an addition to make a grapheme more distinct from others. It can take the form of a v ...


Ligatures and abbreviations

*∪ :
Union Union commonly refers to: * Trade union, an organization of workers * Union (set theory), in mathematics, a fundamental operation on sets Union may also refer to: Arts and entertainment Music * Union (band), an American rock group ** ''Un ...
*∩ :
Intersection In mathematics, the intersection of two or more objects is another object consisting of everything that is contained in all of the objects simultaneously. For example, in Euclidean geometry, when two lines in a plane are not parallel, their i ...
, an upside-down upper case "U"


Computing codes

: 1


Other representations


References


External links

* * * {{Latin alphabet, U} Vowel letters ISO basic Latin letters