SAO
SAO is initials which indicate:
- Smithsonian Astrophysical Observatory , an Astrophysical research center in located at the the United States of America
- Smithsonian Astrophysical Observatory Star Catalog , a Catalog of stars realized by this institution
- Substances Impoverishing the layer of Ozone (CFC, HCFC, halons, Bromide of methyl),
- Session-At-Ounce , a method of engraving of data on disc by session (see also Disk-At-Ounce)
- São Paulo , according to the Code list AITA of the aéroports/S,
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