In Japan, the energy required to throw a shovelful of earth four meters horizontally or two meters vertically. The term was used in the military.
It is not clear from our source whether this is a genuine unit. It might have been used only in the sense of a man having tōdoryoku, i.e., he's a competent digger, rather than as a unit, e.g., it will take 518 tōdoryoku to dig a certain foxhole. Advice, especially examples from documents, from knowledgeable readers would be much appreciated.
H.T. Creswell, J. Hiraoka, and R. Namba.
A Dictionary of Military Terms, English-Japanese, Japanese-English.
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Last revised: 2 August 2004.