Analysis of information sources in references of the Wikipedia article "Angstrom" in English language version.
Use standard abbreviations for ... natural units (e.g., au, pc, cm).
... recommends ... 5. that the unique symbol "au" be used for the astronomical unit.
The units of length/distance are Å, nm, μm, mm, cm, m, km, au, light-year, pc.
The units of length/distance are Å, nm, μm, mm, cm, m, km, au, light-year, pc.
Use standard abbreviations for ... natural units (e.g., au, pc, cm).