S21

S21 stands for:

S21 (Berlin), an S -Bahn project in Berlin
Stuttgart 21, a rail transport and urban project
State Road 21 in Saxony
Dataphon S21, an acoustic
The forward transmission coefficient S21 at the scattering parameters, see scattering parameter # Two goals

S-21 stands for:

S -21 ( torture prison ), a torture prison of the Khmer Rouge, see Tuol Sleng Genocide Museum
S -21: The Khmer Rouge Death Machine, a feature film about the torture prison S-21
Letov Š -21, an aircraft
De Schelde S- 21, a fighter plane
Sukhoi S -21, an adjusted aircraft project of a supersonic business jet

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