Please try to construct complete sentences, and use punctuation correctly:
What is the meaning of 'out of mercury'?
Please tell me what 'out of mercury' means.
The phrase could mean several different things. Please provide more context - at least a complete sentence.
:up: Without context it could mean anything from 'unable to make thermometers for lack of supplies' to 'emanating from the planet in the Solar System that has the shortest orbit'. ;-)