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The sign accompanying the Ascent Propulsion System engine. It reads

Lunar Module Ascent Engine

The ascent engine housed in the upper stage of the lunar module was used to boost the astronauts from the lunar surface to rendezvous with the command module in orbit around the Moon. Developed by Bell Aerospace, it is a constant thrust, pressure-fed rocket motor, burning a mixture of unsymetrical dimethylhydrazine (UDMH) and hydrazine as fuel and nitrogen tetroxide as an oxidizer. The engine produces a maximum thrust of 1588 kilograms (3500 pounds) in space. It features an ablatively cooled combustion chamber.

From National Aeronautics and Space Administration