A (disambiguation)

A is the first letter of the Latin alphabet.

A may also refer to:

cience

* annum
* A battery
* 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
* A+ and A-, human blood types
* Adenine, nucleic acid
* Mass number, abbreviated A

Computing

* A*, a pathfinding algorithm
* A-0 System, early computer compiler
* A+ (programming language)
* A Sharp (Axiom), properly known as "A#"
* BASIC A+
*, the HTML element for an anchor tag
* A# (A port of Ada to the Microsoft .NET Platform, [http://asharp.martincarlisle.com/] )
* The most basic of the three levels of web site accessibility measured by WCAG

The arts

* A (musical note), the sixth musical note
* "A" (album), 1980 album by progressive rock band Jethro Tull
* A (band) is a rock band from Leeds, formed in 1995
* "A" (Cass McCombs album), 2003 album by Cass McCombs
* "A" (song), Ayumi Hamasaki's 10th single, released 1999
* A (TV system), a Canadian television system formerly known as A-Channel.
* A, a rating in India's Central Board of Film Certification
* "A" is a Kannada movie directed by Upendra
* "A", song by Cartel (band)
* "A", song by the band Barenaked Ladies
* A, or "side A," refers to the top or first side of a vinyl record
* "A", major poem by 20th century author Louis Zukofsky
* "a", a novel by 20th century artist Andy Warhol

Linguistics

* A and an, the indefinite article in English
* A (kana), the Japanese kana あ and ア which may be used to represent Asia

Miscellanea

*A-Frame, a type of structure
*A (New York City Subway service), also known as the "A Eighth Avenue Express"
*A, the alternate name for Brfxxccxxmnpcccclllmmnprxvclmnckssqlbb11116, a Swedish child born in 1991
* "The A's", nickname for Oakland Athletics
* A, the U.S. ticker symbol for Agilent Technologies
* A within a circle, used in anarchist symbolism

ee also

* Å (disambiguation)
* A band (disambiguation)
* A Class
* Class A

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