P.56

S56 , S-56 or S.56 stands for:

• Sikorsky S-56 , a piston engine powered American transport helicopter
• Blériot-SPAD S.56 , a double-decker passenger aircraft made by the French manufacturer Blériot Aéronautique
• the name of a series of Explorer satellites from NASA: Air Density Explorer

This is a disambiguation page for differentiating between several terms identified with the same word.