S0

S0 can mean:
* S0 Truss, an element of the International Space Station
* Slok Air Gambia IATA airline designator
* 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 output (DIN 43864) from electricity meters that give pulses proportional to the amount of consumed energy.