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The word at is an English word, which may act as a preposition.

AT (or similar) may also refer to:



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

United States[edit]


Science and technology[edit]

In computing[edit]

In biology and medicine[edit]

In physics and chemistry[edit]

  • Astatine, a chemical element with symbol At
  • Ampere-turn (symbol At), an International System of Units (MKS) unit of magnetomotive force
  • Attotesla, 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[edit]

Other uses[edit]

See also[edit]