S0 may refer to: S0 Truss, an element of the International Space Station S0, elemental sulfur IATA airline designator for Aerolíneas Sosa Previously, IATA airline designator for Slok Air Gambia (disestablished) the representation of the number 1 in Peano arithmetic ACPI S0 power state in computing S0 galaxy, an astronomical code for barless lenticular galaxy S0, part of the name of certain stars within one arc-second of Sagittarius A* S0 (DIN 43864), an output from electricity meters that give pulses proportional to the amount of consumed energy the S0 interface bus used in ISDN BRI in telephony
See also SO (disambiguation) 0S (disambiguation) 42nd Street Shuttle, signed as S but internally designated as 0