duty in Wingdings is ♎︎◆︎⧫︎⍓︎

The efficiency of an engine, especially a steam pumping engine,as measured by work done by a certain quantity of fuel; usually, thenumber of pounds of water lifted one foot by one bushel of coal (94lbs. old standard), or by 1 cwt. (112 lbs., England, or 100 lbs.,United States).