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XAU may refer to:
- The ISO 4217 standard code for one troy ounce of gold, considered as a currency.
- A symbol for the Philadelphia Gold and Silver Index, an index of precious metal mining company stocks that are traded on the Philadelphia Stock Exchange
- An authentication protocol library for X Window System
- A Portuguese slang word, also written as Tchau or simply Chau, from the Italian word Ciao, meaning goodbye/bye.
| disambiguation page lists articles associated with the title XAU.
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