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SAO
+++++ Smithsonian Astrophysical Observatory
+---- Surface Aviation Observation
+---- security assistance officer
AcroLexic: Dictionary of Acronyms and Abbreviations contains 13 more definitions of “SAO”.
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See also

Acronym Definitions
SAO2 3
NASAO 2
USAO 2
JISAO 1
AMSAODD 1