A is the first letter of the Latin and English alphabet.

A may also refer to:

Science and technology

Quantities and units

Astronomy

Biology

Computing

Programming languages

Other uses in computing

Mathematics and logic

Other uses in science and technology

  • A battery, a vacuum tube filament type battery
  • A battery (size), a standard battery size
  • Anode, an electrode
  • A, historical symbol for chemical element argon, currently Ar
  • The center of a hexagonal face of the Brillouin zone of a hexagonal lattice, in physics

Arts and media

Books

Film and TV

Films

Film ratings

Television

Music

Performers

  • A (band), a British alternative rock band

Albums

Songs

Other media

Geography

Linguistics

Letters

  • 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

People

Philosophy and religion

Transport

Automobile

Rail

Ships

Other uses

  • A (grade), an academic grade
  • A series of paper sizes defined by ISO 216, e.g. A4, A5 sizes
  • A formation, an American football offensive formation
  • 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 human-made rock formation in the shape of the letter
  • Alfa, the military time zone code for UTC+01:00
  • Farmall A, a tractor produced by International Harvester from 1939 to 1947

See also

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