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AT or at may refer to:



  • Austria (ISO 2-letter country code)
  • .at, Internet country code top-level domain

United States



Science and technology


  • @ (or "at sign"), the punctuation symbol now typically used in e-mail addresses and tweets)
  • at (command), used to schedule tasks or other commands to be performed or run at a certain time
  • IBM Personal Computer/AT
  • The
    Hayes command set
    for computer modems (each command begins with the character string "AT")

Biology and medicine

Physics and chemistry

  • Astatine (symbol At), a chemical element
  • Ampere-turn (symbol A t), an International System of Units (MKS) unit of magnetomotive force
  • Attotesla
    (symbol aT), 10−18 tesla, an SI derived unit of magnetic flux density
  • Technical atmosphere
    (symbol at), a physical unit of pressure

Other uses in science and technology

Other uses

See also

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