Au, AU, au or a.u. may refer to: Science And Technology Computing .au, the internet country code for Australia Au file format, Sun Microsystems' audio format Audio Units, a system level plug-in architecture from Apple Computer Adobe Audition, a sound editor program Windows Update or Automatic Updates, in Microsoft Windows Windows 10 Anniversary Update, of August 2016a Physics And Chemistry Gold, symbol Au (from Latin ), a chemical element Absorbance unit, a reporting unit in spectroscopy Atomic units, a system of units convenient for atomic physics and other fields Ångström unit, a unit of length equal to 10−10 m or 0.1 nanometre. Astronomical unit, a unit of length often used in Solar System astronomy, an approximation for the average distance between the Earth and the Sun Arbitrary unit, a relative placeholder unit for when the actual value of a measurement is unknown or unimportant ("a.u." is deprecated, use "arb. unit" instead) Arts and entertainment Music AU (band), an experimental pop group headed by Luke Wyland Au, a 2010 release by Scottish rock band Donaldson, Moir and Paterson Au a track on Some Time in New York City by an album by John Lennon & Yoko Ono and Elephant's Memory Magazines Alternative Ulster, a Northern Irish music magazine, now called AU A&U: America's AIDS Magazine, sponsor of the Christopher Hewitt Award Literature Alternative universe (fan fiction), fiction by fan authors that deliberately alters facts of the canonical universe written about. Other Media Au Co, a fairy in Vietnamese mythology Age of Ultron, a 2013 series published by Marvel Comics A.U, a Chinese media franchise and brand Organizations au (mobile phone company), a mobile phone operator in Japan African Union, a continental union Americans United for Separation of Church and State Athletic Union, the union of sports clubs in a British university Austral Líneas Aéreas (IATA code AU) Auxiliary Units, specially trained, highly secret units created by the United Kingdom government during the Second World War Universities Asia Ajou University in Suwon, Gyeonggi, South Korea Abasyn University in Peshawar, Khyber Pakhtunkhwa, Pakistan Andhra University in Visakhapatnam, AP, India Anhui University in Hefei, Anhui, China Aletheia University in New Taipei City, Taiwan Allahabad University in Allahabad, Uttar Pradesh, India Arellano University in Philippines Assumption University (Thailand) in Thailand Abhilashi University in Himachal Pradesh, India Adesh University in Bathinda, Punjab, India. Europe Aarhus University in Aarhus, Denmark Aberystwyth University in Aberystwyth, Wales, United Kingdom