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The sign which accompanied the SSME in its indoors location. It reads

Space Shuttle Main Engine: SSME

When a Space Shuttle lifts off the launch pad it does so with the help of three reusable high-performance rocket engines. The Space Shuttle Main Engines (SSMEs) provide thrust in conjunction with two Solid Rocket Boosters (SRBs) during launch.

Thrust: 408,750 lb
Propellant: Liquid Oxygen/Liquid Hydrogen
Mixture ratio: 6:1
Weight: 6,990 lb

Additional information on the Shuttle at the West Mezzanine.

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