Au
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, chemical symbol Au 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.