https://en.wikipedia.org/wiki/Sao
Places. Sao civilisation, in Middle Africa from 6th century BC to 16th century AD; Sao, a town in Boussé Department, Burkina Faso; Saco Transportation Center (station code SAO), a train station in Saco, Maine, U.S.; SAO, the ICAO airline designator for Sahel Aviation Service, Mali; SAO, the IATA airport code for airports in the São Paulo metropolitan area, Brazil