A (disambiguation)

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A is the first letter of the alphabet. It may also refer to:

  • In English, it is one of the two indefinite articles, the other being an.
  • In measurement, A is a symbol for area.
  • In medicine, A is one of the human blood types.
  • In music, A is a note.
  • In the SI, A is the symbol for the ampere (which is also shortened to amp).
  • In school, an A+ is the highest grade you can get, with an A being the grade below.
  • In transport, A is the international license plate code for Austria.