B is the second letter of the Latin alphabet. B may also refer to:

Science, technology, and mathematics

Astronomy

* Astronomical objects in the Barnard list of dark nebulae (abbreviation B) * Latitude (''b'') in the

galactic coordinate system The galactic coordinate system is a celestial coordinate system in spherical coordinates, with the Sun as its center, the primary direction aligned with the approximate center of the Milky Way Galaxy, and the fundamental plane parallel to an ap ...

Biology and medicine

Haplogroup B (mtDNA) In human mitochondrial genetics, haplogroup B is a human mitochondrial DNA (mtDNA) haplogroup. Origin Haplogroup B is believed to have arisen in Asia some 50,000 years before present. Its ancestral haplogroup was haplogroup R. The greatest vari ...

, a human mitochondrial DNA (mtDNA) haplogroup *

Haplogroup B (Y-DNA) Haplogroup B (M60) is a human Y-chromosome DNA haplogroup common to paternal lineages in Africa. It is a primary branch of the haplogroup BT. B (M60) is common in parts of Africa, especially the tropical forests of West-Central Africa. It was ...

, a Y-chromosomal DNA (Y-DNA) haplogroup * Blood type B * ATC code B ''Blood and blood forming organs'', a section of the Anatomical Therapeutic Chemical Classification System * Vitamin B * Hepatitis B *

Berlin Botanical Garden and Botanical Museum The Berlin Botanic Garden and Botanical Museum (german: Botanischer Garten und Botanisches Museum Berlin) is a botanical garden in the locality of the borough of , Berlin, Germany. Constructed between 1897 and 1910 under the guidance of archi ...

, assigned the abbreviation B as a repository of herbarium specimens

Computing

* B (programming language) * B-Method, for computer software development * B-tree, a data structure * Bit (b) *

Byte The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit ...

(B) * , an

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 1993 ...

denoting bold text

Physical and chemical quantities and units

* One of the reciprocal lattice vectors (''b*'') * Breadth (''b''); see

length Length is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance. In most systems of measurement a base unit for length is chosen, from which all other units are derived. In the Interna ...

Impact parameter In physics, the impact parameter is defined as the perpendicular distance between the path of a projectile and the center of a potential field created by an object that the projectile is approaching (see diagram). It is often referred to in nu ...

(''b'') *

Molality Molality is a measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent. This contrasts with the definition of molarity which is based on a specified volume of solution. A commonly used unit for molali ...

(''b'') *

Barn (unit) A barn (symbol: b) is a metric unit of area equal to (100 fm2). Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions, today it is also used in all fields of high-energy physics to exp ...

(b), a unit of area *

Magnetic field A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to ...

(''B'') * Napierian

absorbance Absorbance is defined as "the logarithm of the ratio of incident to transmitted radiant power through a sample (excluding the effects on cell walls)". Alternatively, for samples which scatter light, absorbance may be defined as "the negative lo ...

(''B'') * Rotational constant (''B'') * Second virial coefficient (''B'') *

Susceptance In electrical engineering, susceptance (''B'') is the imaginary part of admittance, where the real part is conductance. The reciprocal of admittance is impedance, where the imaginary part is reactance and the real part is resistance. In SI unit ...

(''B'') * Bel (''B''), a logarithmic unit equal to ten

decibel The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a po ...

Other uses in science, technology, and mathematics

* ''B'', a

modal logic Modal logic is a collection of formal systems developed to represent statements about necessity and possibility. It plays a major role in philosophy of language, epistemology, metaphysics, and natural language semantics. Modal logics extend other ...

* Boolean domain (

\mathbb

), in mathematics *

Boron Boron is a chemical element with the symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the ''boron group'' it has th ...

, symbol B, a chemical element *

Bulb (photography) The Bulb setting (abbreviated B) on camera shutters is a momentary-action mode that holds shutters open for as long as a photographer depresses the shutter-release button. The Bulb setting is distinct from shutter's Time (T) setting, which is a ...

, a shutter-speed setting * B battery, a battery used to provide the plate voltage of a

vacuum tube A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. The type kn ...

* B horizon, a layer of soil commonly known as subsoil * B, B+ and B−, expressions of buoyancy in convective available potential energy

Linguistics

* В, a letter of the Cyrillic alphabet * Voiced bilabial stop (b, in the International Phonetic Alphabet)

Arts and media

Music

Musical notation

* B (musical note) *

B major B major (or the key of B) is a major scale based on B. The pitches B, C, D, E, F, G, and A are all part of the B major scale. Its key signature has five sharps. Its relative minor is G-sharp minor, its parallel minor is B minor, and its ...

, a scale *

B minor B minor is a minor scale based on B, consisting of the pitches B, C, D, E, F, G, and A. Its key signature has two sharps. Its relative major is D major and its parallel major is B major. The B natural minor scale is: : Changes neede ...

, a scale * B major chord, Chord names and symbols (popular music) *

Flat (music) In music, flat (Italian bemolle for "soft B") means "lower in pitch". Flat is the opposite of sharp, which is a raising of pitch. In musical notation, flat means "lower in pitch by one semitone (half step)", notated using the symbol which is deri ...

, a note lower in pitch by a semitone

Performers

Beyoncé Beyoncé Giselle Knowles-Carter ( ; born September 4, 1981) is an American singer, songwriter, and actress. Beyoncé's boundary-pushing artistry and vocals have made her the most influential female musician of the 21st century, according to ...

* B, member of

Superorganism (band) Superorganism are an indie pop band based in London, formed in early 2017. The group originally consisted of eight members: lead vocalist Orono Noguchi, as well as Emily, Harry, Tucan, Robert Strange, Ruby, B, and Soul. Many of the group's memb ...

Recordings

* ''B'' (BamBam EP), an extended play by BamBam * ''B'' (Battles EP), an extended play by Battles * ''B'' (I Am Kloot album), a compilation album by I Am Kloot * ''b'' (Moxy Früvous EP), an extended play by Moxy Früvous * "b", an Iamamiwhoami song * "B", a song by Todrick Hall from his 2018 album '' Forbidden''

Other media

* /b/, a board on 4chan * ''b'' (newspaper), a free daily, tabloid sized newspaper, published by ''The Baltimore Sun'' * ''

Codex Vaticanus Graecus 1209 The Codex Vaticanus ( The Vatican, Bibl. Vat., Vat. gr. 1209), designated by siglum B or 03 (in the Gregory-Aland numbering), δ 1 ( von Soden), is a fourth-century Christian manuscript of a Greek Bible, containing the majority of the Greek Old ...

'', an ancient bible *

Rajawali Televisi Rajawali Televisi (RTV, stylized as rtv) is a commercial television network in Indonesia, owned by Rajawali Corpora. RTV is currently segmented as "family television", licensed via the Ministry of Communication and Information Technology, and ...

, previously named B Channel, a television channel in Indonesia * B, the production code for the 1963–64 ''Doctor Who'' serial ''

The Daleks ''The Daleks'' (also known as ''The Mutants'' and ''The Dead Planet'') is the second serial in the British science fiction television series '' Doctor Who'', which was first broadcast on BBC TV in seven weekly parts from 21 December 1963 to ...

'' * B, a character in '' Total Drama: Revenge of the Island'' * '' "B" Is for Burglar'', the second novel in Sue Grafton's "Alphabet mystery" series, published in 1985

Places

* Belgium, on the vehicle registration plates of the European Union * Bucharest, on the

vehicle registration plates of Romania The most common format for vehicle registration plates in Romania consists of black letters on white background in the format CC 12 ABC, where CC is a two letter county code, 12 is a two digit group, and ABC is a three letter group. F ...

Sport

* Australian rules football positions#Full back, in Australian Rules football * B, often used after the name of football clubs to denote a

reserve team In sports, a reserve team is a team composed of players under contract to a club but who do not normally play in matches for the first team. Reserve teams often include back-up players from the first team, young players who need playing time to i ...

Transportation

* B (New York City Subway service) *

B Line (Los Angeles Metro) The B Line (formerly Red Line from 1993–2020) is a fully underground rapid transit line operating in Los Angeles, running between Downtown Los Angeles and North Hollywood. It is one of seven lines on the Metro Rail system, operated by the L ...

Line B (Buenos Aires Metro) Line B of the Buenos Aires Underground runs from Leandro N. Alem to Juan Manuel de Rosas in Villa Urquiza. Line B opened to the public on 17 October 1930. In recent years, it has held the title of being the most used line of the Buenos Aires ...

B (S-train) B is a service on the S-train network in Copenhagen. It runs between Farum and Høje Taastrup and provides stopping services on the S-train system's Farum radia and Tåstrup radial. B is one of the base services on the network, running every ...

, in Copenhagen * RER B, a line in the RER of Paris * Bundesstraße (federal highway) in Austria and Germany (abbreviation B) *

Bayshore Route The signed as Route B, is one of the routes of the tolled Shuto Expressway system in the Greater Tokyo Area. The Bayshore Route is a stretch of toll highway that runs from the Kanazawa ward of Yokohama in the west, northeast to the city of ...

of Shuto Expressway in Japan, numbered as route B

Other uses

B (grade) This is a list of grading systems used by countries of the world, primarily within the fields of secondary education and university education, organized by continent with links to specifics in numerous entries. Africa Nigeria The choice of gr ...

, for evaluation of students' work *

B (bank) B was a banking brand in the United Kingdom which operated between 2016 and 2019 as a trading division of Clydesdale Bank plc. B focused on app-based banking and computer learning of personal finances to help customers manage their money. Histo ...

, a banking brand in the United Kingdom *

Barnabites , image = Barnabites.svg , image_size = 150px , caption = One version of the Barnabite logo. "P.A." refers to Paul the Apostle and the three hills symbolize the vows of poverty, chastity and obedience. , a ...

( la, Clerici Regulares Sancti Pauli), a religious order abbreviated to the postnominal ''B.'' *

Bravo Bravo(s) or The Bravo(s) may refer to: Arts and entertainment Music Groups and labels *Bravo (band), a Russian rock band * Bravo (Spanish group), represented Spain at Eurovision 1984 *Bravo Music, an American concert band music publishing company ...

, the military time zone code for UTC+02:00 * Brutus, a Roman cognomen (abbreviation B) *

Farmall B The Farmall B is a small one-plow row crop tractor produced by International Harvester under the Farmall brand from 1939 to 1947. It was derived from the popular Farmall A, but was offered with a narrow set of centerline front wheels instead of t ...

, a tractor produced by International Harvester from 1939 to 1947 * Dominical letter B for a

common year starting on Saturday A common year starting on Saturday is any non-leap year (i.e. a year with 365 days) that begins on Saturday, 1 January, and ends on Saturday, 31 December. Its dominical letter hence is B. The current year, 2022, is a common year starting on Saturd ...