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JenerDerBleibt
1 year ago

This is a Greek letter called Eta. Used for various things like haptic in complex bonds or viscosity. However, energy efficiency is most likely.

HansWurst45
1 year ago

This looks like a eta and would then stand for efficiency

https://de.wikipedia.org/wiki/efficiency

Max3909
1 year ago

I can’t answer your question, but I think you mean this. This can help other users to answer your question.