XAU may refer to:
* The
ISO 4217
ISO 4217 is a standard published by the International Organization for Standardization (ISO) that defines alpha codes and numeric codes for the representation of currencies and provides information about the relationships between individual cu ...
currency code for one troy ounce of
gold
Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile met ...
* 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
The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems.
X provides the basic framework for a GUI environment: drawing and moving windows on the display device and interacting wit ...
* A Portuguese slang word, also written as ''Tchau'' or simply ''Chau'', from the Italian word ''Ciao'', meaning goodbye/bye
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