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U, or u, is the twenty-first letter of the English alphabet. U may also refer to:


Science


Mathematics

* \cup,
union (set theory) In set theory, the union (denoted by ∪) of a collection of Set (mathematics), sets is the set of all element (set theory), elements in the collection. It is one of the fundamental operations through which sets can be combined and related to e ...
* U-set, a set of uniqueness * U, the unitary group


Chemistry

*
Uranium Uranium is a chemical element; it has chemical symbol, 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. Ura ...
, symbol U, a chemical element * u, the
Dalton (unit) The dalton or unified atomic mass unit (symbols: Da or u, respectively) is a unit of mass defined as of the mass of an Bound state, unbound neutral atom of carbon-12 in its nuclear and electronic ground state and invariant mass, at rest. It is ...
, a unified atomic mass unit to express atomic and molecular masses


Astronomy

* U, ultraviolet magnitude, in a UBV photometric system * U, an October 16 through 31 discovery in the provisional designation of a
comet A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or Coma (cometary), coma surrounding ...
* U (trans-Neptunian object), a possible extremely distant trans-Neptunian object


Computing

* , a now-deprecated
HTML element An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). The first used version of HTML was written by Tim Berners-Lee in 199 ...
denoting underlined text * U, representing 1.75" as the minimal height of a rack unit * U, representing a 10x10x10cm CubeSat * U, universal Turing machine


Biology

* U, abbreviation for
uracil Uracil () (nucleoside#List of nucleosides and corresponding nucleobases, symbol U or Ura) is one of the four nucleotide bases in the nucleic acid RNA. The others are adenine (A), cytosine (C), and guanine (G). In RNA, uracil binds to adenine via ...
* U, mitochondrial haplogroup U


Other scientific uses

* U, a common notation for
potential energy In physics, potential energy is the energy of an object or system due to the body's position relative to other objects, or the configuration of its particles. The energy is equal to the work done against any restoring forces, such as gravity ...
* U, the middle of an edge joining a hexagonal and a square face of the Brillouin zone of a face-centered cubic lattice, in solid-state physics * U, one of the two subcarrier-modulated color-difference channels in the YUV colorspace, in video * U, the recommended symbol for a system's
internal energy The internal energy of a thermodynamic system is the energy of the system as a state function, measured as the quantity of energy necessary to bring the system from its standard internal state to its present internal state of interest, accoun ...
, in thermodynamics * U, units, any of various standard units of
biological activity In pharmacology, biological activity or pharmacological activity describes the beneficial or adverse effects of a drug on living matter. When a drug is a complex chemical mixture, this activity is exerted by the substance's active ingredient or ...
, such as insulin units, enzyme units, or penicillin units ** U, the enzyme unit ** International units, for which the symbol U is sometimes used * U, the abbreviation for selenocysteine, an uncommon amino acid containing selenium * u, the alternative abbreviation for the SI prefix "
micro- ''Micro'' (Greek letter μ, Mu (letter), mu, non-Italic type, italic) is a metric prefix, unit prefix in the metric system denoting a factor of one millionth (10−6). It comes from the Ancient Greek, Greek word (), meaning "small". It is the ...
" when the Greek letter mu (μ) is not available *U or U-value, the symbol for the overall heat transfer coefficient or thermal transmittance


Transportation

* U Line, also known as the Uijeongbu Line, a light metro line in Seoul * Transilien Line U, a line of the Paris transport network * U (Los Angeles Railway), a former streetcar line in Los Angeles * Yurikamome, an automated guideway line in Tokyo, labeled * The official West Japan Railway Company service symbol for: **
Sakurai Line The is a railway line operated by West Japan Railway Company (JR West) in Nara Prefecture. It connects Nara Station, Nara on the Yamatoji Line to Takada Station (Nara), Takada on the Wakayama Line, with some services continuing on the Wakayama L ...
. ** Kibi Line.


Music

* '' ’u’'', the first opera in the Klingon language * "U" (Kendrick Lamar song), 2015 * "U" (Super Junior song), 2006 * ''U'' (Incredible String Band album), 1970 * ''U'' (NiziU album), 2021 * ''U'' (Tourist album), 2016 album by Tourist * "U", a song by KNK from '' Remain'' * "U", a song by Pearl Jam on their album '' Lost Dogs'' * "U", a song by Stray Kids on their mixtape '' Hop'' * "U", a song by S.E.S., released in 2002 * "U", an album by The Enid, released in 2019 * "U", a song by Treasure (band), released in 2022


People

* An honorific used in
Burmese names Burmese names () lack the serial structure of most Western names. Like other Mainland Southeast Asian people (except Vietnamese), the people of Myanmar have no customary matronymic or patronymic naming system and no tradition of surnames. Alt ...
* An alternative spelling of Woo (Korean surname), including a list of people with that family name * An alternative spelling of Woo (Korean given name), including a list of people with that given name * U of Goryeo (1363–1389), king of Goryeo (Korea), often called King Woo


Places

* U, Federated States of Micronesia * Ü-Tsang, one of three historical provinces of Tibet ** Ü (region), a particular region of Ü-Tsang


Language

* /u/, the close back rounded vowel in the International Phonetic Alphabet * U language, a language spoken by about 40,000 people in the Yunnan Province of China * U (cuneiform), a cuneiform sign * U (Cyrillic), a letter of the Cyrillic script * U (kana), a Japanese syllabary symbol * U and non-U English, sociolectal varieties of British English * Ս, glyph for the Armenian letter se * ''u'', an abbreviation for " you" in computer chats * U-, a prefix used for German
submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...
s during World War II * U, a title roughly equal to "Mister" in Burmese * The Greek letter μ


Film and television

* ''U'' (film), a 2006 French animated feature film directed by Serge Elissalde and Grégoire Solotareff * ''The U'' (film), a 2009 documentary about the Miami Hurricanes football team * U (Universal), a media
content rating A content rating (also known as maturity rating) rates the suitability of TV shows, movies, comic books, or video games to this primary targeted audience. A content rating usually places a media source into one of a number of different categories, ...
used in the following countries: ** United Kingdom, issued by the British Board of Film Classification ** India, issued by the
Central Board of Film Certification The Central Board of Film Certification (CBFC) is a statutory Motion picture content rating system, film-certification body in the Ministry of Information and Broadcasting (India), Ministry of Information and Broadcasting of the Government of ...
** Malaysia, issued by the Film Censorship Board of Malaysia ** France, documented at Censorship in France ** India, Latvia, Malta, Mauritius and Slovakia, documented at Motion picture content rating system and Television content rating system * U (TV channel), a former television channel in New Zealand * U, the production code for the 1965 ''Doctor Who'' serial '' The Myth Makers'' *The American Spanish-language network
Univisión Univision () is an American Spanish-language terrestrial television, free-to-air television network owned by TelevisaUnivision. It is the United States' largest provider of Spanish-language content. The network's programming is aimed at the L ...
has the U logo * U (streaming service), (formerly UKTV Play) a free British streaming service owned by UKTV


Other uses

*
University A university () is an educational institution, institution of tertiary education and research which awards academic degrees in several Discipline (academia), academic disciplines. ''University'' is derived from the Latin phrase , which roughly ...
, commonly abbreviated "U" * U Mobile, Malaysian mobile phone and data service provider * U-bend, a U-shaped plumbing trap * U-bolt, a U-shaped metal fastener * Ⓤ, (U inside a circle), hechsher or kosher certification by the Orthodox Union * U, =U= or -U-, symbol for
Ustaše The Ustaše (), also known by anglicised versions Ustasha or Ustashe, was a Croats, Croatian fascist and ultranationalist organization active, as one organization, between 1929 and 1945, formally known as the Ustaša – Croatian Revolutionar ...
Croatian movement * Nickname for football teams: ** La U or Universitario de Deportes, Peru ** Universitatea Cluj, Romania * U, the color blue in '' Magic: The Gathering'' * Wii U, the sixth Nintendo video game home console, released in 2012 *
Uniform A uniform is a variety of costume worn by members of an organization while usually participating in that organization's activity. Modern uniforms are most often worn by armed forces and paramilitary organizations such as police, emergency serv ...
, the military time zone code for UTC−08:00 * '' "U" Is for Undertow'', the twenty-first novel in Sue Grafton's "Alphabet" mystery series, published in 2009 *
Underscore An underscore or underline is a line drawn under a segment of text. In proofreading, underscoring is a convention that says "set this text in italic type", traditionally used on manuscript or typescript as an instruction to the printer. Its ...
, originally invoked in HTML using * U, a brand of menstrual hygiene products by Kotex * U, the logo for Unilever


See also

* The U (disambiguation) * U class (disambiguation) * You (disambiguation) {{disambiguation