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1º_ 'Au' is the chemical symbol of gold. 2º_ 'au' is the symbol for astronomical unit , a measurement of 149 82''597 82''870 82''700 meters that would be the distance between the Sun and the Earth. It is used in English-speaking countries, in our language ua is preferred. 3º_ ' . au' is the internet domain for Australia. 4º_ 'Au' is the name of a commune in the district of Rheintal in the canton of St. Gallen in Switzerland. 5th_ 'Au'? name of a municipality in the district of Breisgau-Upper Black Forest (Germany). 6th 'au' ( pr . eeiuú) is the name of a Japanese mobile phone company, which has its version 12456; 125( 12518; 125( , but the mark is written in Latin characters and in italics. 7º_ 'AU' is a brand and acronym for the Mexican motor transport company Autobuses Unidos ( S . To. of C . V . ) .