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A es la primera letra del alfabeto latino e inglés.
A también puede referirse a:
Ciencia y tecnología [ editar ]
Cantidades y unidades [ editar ]
- a ' , una medida de la atracción entre partículas en la ecuación de Van der Waals
- Un valor ( A ), una medida de los efectos de los sustituyentes en la estereoquímica del ciclohexano.
- Absorbancia ( A )
- Aceleración ( a )
- Actividad (química) ( a )
- Adsorción (a)
- Annum (a), por año
- son (a), una unidad de área igual a 100 metros cuadrados (redirecciona a hectárea )
- atto- (a), el prefijo SI que significa 10 −18
- Amperio (A), la unidad base SI de corriente eléctrica
- ångström (Å), una unidad de longitud igual a 1 × 10 −10 metros
- Área ( A )
- Coeficiente de atenuación ( a )
- Radio de Bohr ( a 0 )
- Afinidad química ( A )
- Ganancia (electrónica) ( A )
- Coeficiente Hall ( A H )
- Constante de Hamaker ( A )
- Energía libre de Helmholtz ( A )
- Constante de acoplamiento hiperfina ( a o A )
- Potencial de vector magnético ( A )
- Número de masa ( A )
- Factor preexponencial ( A )
- El vector o los vectores reticulares recíprocos o únicos ( a * )
- Masa atómica relativa ( A r )
- Constante de Richardson ( A )
- Constante rotacional ( A )
- Superficie específica ( a )
- Difusividad térmica ( a )
- Longitud de celda unitaria ( a )
Astronomía [ editar ]
- Una clase de estrellas de color azul blanquecino en el sistema Morgan-Keenan; ver clasificación estelar
- Parte de la designación provisional de un cometa (p. Ej., C / 1760 A1), que indica un descubrimiento del 1 al 15 de enero
- The semi-major axis of an orbit
Biology[edit]
- A+ and A−, human blood types
- Vitamin A, also called retinol, an essential human nutrient
- Haplogroup A (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
- Haplogroup A (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
- Adenine, a nucleic acid
- Adenosine, a nucleoside
- Alanine, an amino acid
- ATC code A, Alimentary tract and metabolism, a section of the Anatomical Therapeutic Chemical Classification System
Computing[edit]
Programming languages[edit]
- A+ (programming language)
- A ♯ , un lenguaje de programación funcional orientado a objetos
- Un Sharp (.NET) (también escrito "A #"), un puerto de Ada a la plataforma Microsoft .NET
- BÁSICO A +
Otros usos en informática [ editar ]
- Un * algoritmo de búsqueda , un algoritmo de búsqueda de caminos
- A-0 System , uno de los primeros compiladores informáticos
<a></a>
, el elemento HTML de una etiqueta de anclaje- a, equivalente (qname) a la propiedad de esquema RDF rdf: type
- Un nivel de accesibilidad web definido por las Pautas de accesibilidad al contenido web.
- El tipo de registro de direcciones de DNS, definido en RFC 1035
Matemáticas y lógica [ editar ]
- Un dígito numérico que significa diez en hexadecimal y otros sistemas numéricos posicionales con una base de 11 o más
- A veces, en negrita representa los números algebraicos ( ) (U + 1D538 en Unicode)
- Cuantificador universal en lógica simbólica (símbolo ∀ o , una letra A invertida)
- Universal afirmativo, uno de los cuatro tipos de proposiciones categóricas en lógica
- La constante de Mills está representada por el símbolo A
- La constante Glaisher-Kinkelin también se representa a menudo con el símbolo A
Otros usos en ciencia y tecnología [ editar ]
- A battery, a vacuum tube filament type battery
- A battery (size), a standard battery size
- Anode, an electrode
- Argon, symbol formerly A, now Ar
- The center of a hexagonal face of the Brillouin zone of a hexagonal lattice, in physics
Arts and media[edit]
Books[edit]
- "A", a major poem by twentieth century author Louis Zukofsky
- a, A Novel, by twentieth century artist Andy Warhol
- A, the name of the Fourth Raikage, the leader of Kumogakure in the Naruto manga series
- A (Pretty Little Liars), the main antagonist in the Pretty Little Liars book and TV series
- A (for "adultery"), the titular letter in the novel The Scarlet Letter
- "A" Is for Alibi, the first novel in Sue Grafton's "Alphabet mystery" series, published in 1982
- Matthew Arnold, who used the pseudonym "A"
- Isaac Asimov, who used the pseudonym "Dr. A"
- Alexander Pope, who used the pseudonym "A"
Film and TV[edit]
Films[edit]
- A (1965 film), a short film animated by Jan Lenica
- A (1998 Kannada film), an Indian movie directed by Upendra
- A (1998 Japanese film), a documentary film about a Buddhist sect called "A"
- A (2002 film), a British documentary film
Film ratings[edit]
- A, a rating in India's Central Board of Film Certification
- A certificate, a film rating used by the Canadian motion picture rating system
- A, a British Board of Film Classification rating used from 1912 to 1982, see History of British film certificates
Television[edit]
- CTV 2, a Canadian television system formerly known as A-Channel and A
- A, the main antagonist and unknown character of the show Pretty Little Liars
- "A" (The Walking Dead), an episode of the television series The Walking Dead
- A, code name of Ange, the main protagonist of the anime show Princess Principal
- The A logo for the Spanish network Antena 3.
- A, the production code for the 1963 Doctor Who serial An Unearthly Child
Music[edit]
- A (musical note), the sixth solfège note
- A major, a scale
- A minor, a scale
- A major chord; see Chord names and symbols (popular music)
Performers[edit]
- A (band), a British alternative rock band
Albums[edit]
- A (Agnetha Fältskog album), 2013
- A (Cass McCombs album), 2003
- A (Jimmy Raney album), 1957
- A (Jethro Tull album), 1980
- A (Usher and Zaytoven album), 2018
- A, a Denki Groove album (read as "Ace")
- A (Ayumi Hamasaki EP), a 1999 EP by Ayumi Hamasaki
- A (Big Bang single album), a 2015 single by the Korean band Big Bang
- A!, Alexa Feser 2019
- A' (album), an album by Afrirampo
Songs[edit]
- A or Side A, the top or first side of a gramophone record
- "A" (Rainbow song), a 2010 single by Rainbow
- "A", song by Got7 from Got Love (2014)
- "A", song by the band Barenaked Ladies from Maybe You Should Drive
- "A", song by Cartel from Chroma
- "A", a song in the Dance Dance Revolution video game series, by DJ Amuro
Other media[edit]
/a/
, the anime and manga section on 4chan- A, a Japanese video game rating in the Computer Entertainment Rating Organization suitable for all ages.
Geography[edit]
- Austria, on the vehicle registration plates of the European Union
- "The A", a nickname for the U.S. city of Atlanta, Georgia
Linguistics[edit]
Letters[edit]
- A (or a), the first letter of the Latin alphabet
- A (Bengali), the romanized name of the Bengali letter অ
- A (cuneiform), the romanized name of a cuneiform sign
- A (Cyrillic) (A or а), the first letter of the Cyrillic alphabet
- A (kana) (or a), the romanized name of the Hiragana syllable letter あ and of the Katakana syllable letter ア used in Japanese, which may also be used to represent Asia
- Alpha (Α or α), the first letter of the Greek alphabet
Other uses in linguistics[edit]
- A and an, the indefinite article in English
- A, a glossing abbreviation for agent-like argument of canonical transitive verb
- a, the IPA representation of the open front unrounded vowel
- ɑ, the IPA representation of the open back unrounded vowel
- a., an abbreviation of ante (Latin for "before") used in etymologies
People[edit]
- A Martinez, an American actor and singer
- Matthew Arnold, who used the pseudonym "A"
- Isaac Asimov, who used the pseudonym "Dr. A"
- Alexander Pope, who used the pseudonym "A"
- Brfxxccxxmnpcccclllmmnprxvclmnckssqlbb11116, a Swedish child born in 1991, alternately called "A"
Philosophy and religion[edit]
- A, the Dominical letter of a common year starting on Sunday
- Scarlet A, symbol for atheism adopted by the Out Campaign, a public awareness initiated by Elizabeth Cornwell and Richard Dawkins
- Alpha, (sometimes A) in Christian theology, a metaphor for the beginning/creation of time and matter
- An anarchist symbol, an A within a circle
Transport[edit]
Automobile[edit]
- Ford Model A, a name used by two separate cars produced by the Ford Motor Company:
- Ford Model A (1903–04)
- Ford Model A (1927–31)
- Geometry A, an electric mid-size sedan by Geely Auto
Rail[edit]
- A (New York City Subway service), also known as the "A Eighth Avenue Express"
- A (S-train) a service on the S-train network in Copenhagen
- Alton Railroad (reporting mark)
- Line A (Prague Metro)
- NZR A class (disambiguation) two New Zealand steam locomotive classes
Ships[edit]
- A (motor yacht) (M/Y A), a 119m yacht owned by Andrey Melnichenko
- A (sailing yacht) (S/Y A), a 143m yacht owned by Andrey Melnichenko
- SMS A, a Kaiserliche Marine tanker
Other uses[edit]
- A (grade), an academic grade
- A series of paper sizes defined by ISO 216, e.g. A4, A5 sizes
- A-Frame, a type of structure
- Ace, a playing card
- Agilent Technologies, with U.S. ticker symbol A
- Sentinel Peak (Arizona), more commonly known as "A" Mountain for the man-made rock formation in the shape of the letter
- Alfa, the military time zone code for UTC+01:00
See also[edit]
- Å (disambiguation)
- ⓐ and Ⓐ, see Enclosed Alphanumerics
- Class A (disambiguation)
- Model A (disambiguation)
- Circled-a (disambiguation)
- Single-A, or Class A, a classification of minor league baseball
- A band (disambiguation)
- A class (disambiguation)
- A type (disambiguation)
- Aleph (disambiguation)
- Alpha (disambiguation)
- A1 (disambiguation)
- AA (disambiguation)
- AAA (disambiguation)
- AAAA (disambiguation)