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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

Biology and medicine

• Haplogroup B (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
• Haplogroup B (Y-DNA), 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, 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 (B)
• <b></b>, an HTML element denoting bold text

Physical and chemical quantities and units

• One of the reciprocal lattice vectors (b*)
• Breadth (b); see length
• Impact parameter (b)
• Molality (b)
• Barn (unit) (b), a unit of area
• Magnetic field (B)
• Napierian absorbance (B)
• Rotational constant (B)
• Second virial coefficient (B)
• Susceptance (B)
• Bel (B), a logarithmic unit equal to ten decibels

Other uses in science, technology, and mathematics

• B, a modal logic
• bottom quark (symbol: b), an elementary particle
• B meson, a type of meson
• Boolean domain (${\displaystyle \mathbb {B} }$), in mathematics
• Boron, symbol B, a chemical element
• Bulb (photography), a shutter-speed setting
• B battery, a battery used to provide the plate voltage of a vacuum tube
• 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, a scale
• B minor, a scale
• B major chord, Chord names and symbols (popular music)
• ♭ Flat (music), a note lower in pitch by a semitone

Performers

• Beyoncé
• B, member of Superorganism (band)

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, an ancient bible
• Rajawali Televisi, previously named B Channel, a television channel in Indonesia
• B, the production code for the 1963–64 Doctor Who serial The Daleks
• 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

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

Transportation

• B (New York City Subway service)
• B Line (Los Angeles Metro)
• Line B (Buenos Aires Metro)
• B (S-train), in Copenhagen
• RER B, a line in the RER of Paris
• The West Japan Railway Company service symbol for:
  • Kosei Line
  • Inbi Line
  • Kabe Line
• Bundesstraße (federal highway) in Austria and Germany (abbreviation B)
• Bayshore Route of Shuto Expressway in Japan, numbered as route B
• Mexico City Metro Line B

Other uses

• B (grade), for evaluation of students' work
• B (bank), a banking brand in the United Kingdom
• Barnabites (Latin: Clerici Regulares Sancti Pauli), a religious order abbreviated to the postnominal B.
• Bravo, the military time zone code for UTC+02:00
• Brutus, a Roman cognomen (abbreviation B)
• Farmall B, a tractor produced by International Harvester from 1939 to 1947
• Dominical letter B for a common year starting on Saturday
• B, a soft grade of pencil lead

See also

• B postcode area (United Kingdom)
• B class (disambiguation)
• Class B (disambiguation)
• B1 (disambiguation)
• B2 (disambiguation)
• Be (disambiguation)
• Bea (disambiguation)
• Bee (disambiguation)
• Bet (disambiguation)
• Beta (disambiguation)
• BB (disambiguation)
• BBB (disambiguation)
• Plan B (disambiguation)

• Disambiguation pages