AR, Ar, or A&R may refer to:

Arts, entertainment, and media

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Music

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Periodicals

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Other media

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Business

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Language

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  • Ar, the Latin letter R when spelled out
  • Ar (cuneiform), a cuneiform combined sign
  • Arabic, by ISO 639-1 language code

Mathematics, science, and technology

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Computing

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Biology and medicine

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Mathematics

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Physics and chemistry

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Other uses in science and technology

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Military and weapons

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Places

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Politics and ethics

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Other uses

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