Au - Wikipedia
https://en.wikipedia.org/wiki/Au
Gold (chemical symbol: Au), 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 ...
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