AU

AU

1. (international standards) ISO 3166-1 alpha-2 country code for Australia.

   Synonym: AUS (alpha-3)

The code includes the Ashmore and Cartier Islands and the Coral Sea Islands.

AU

1. astronomical unit

Though "AU" is in frequent use by professional bodies and the public, the unit symbol au is recommended by the IAU and ua by the BIPM.

• au (IAU recommended unit symbol for astronomical units)
• ua (BIPM recommended unit symbol for astronomical units)
• ㍳ (Unicode glyph for astronomical unit)

• UA

• a.u., A.U., A. U.

AU (not comparable)

1. (numismatics) Initialism of almost uncirculated.

AU (countable and uncountable, plural AUs)

1. (medicine, dermatology) Initialism of alopecia universalis.
2. (astronomy, metrology) Initialism of astronomical unit.
   • 2008, BioWare, Mass Effect, Redwood City: Electronic Arts, →ISBN, →OCLC, PC, scene: Tuntau:

     Tuntau is an enormous, low-density terrestrial planet, with a thick atmosphere of methane and helium. Despite being nearly 20 AU from Phoenix, the star's great heat and the insulating thickness of the atmosphere make the surface surprisingly temperate.

3. (physics, metrology) Initialism of angstrom unit.
4. (fandom slang) Initialism of alternate universe.
5. Initialism of arbitrary unit.

AU

1. Initialism of African Union.

• AUKUS

• U/A, UA, uA

• IPA^(key): /ˈa.u/, [ˈa.u]

AU (plural AU-AU, first-person possessive AUku, second-person possessive AUmu, third-person possessive AUnya)

1. Initialism of angkatan udara (“air force”).