See also: si
In China, ? - 20ᵗʰ century, a unit of mass, the smallest named unit in Chinese weights. Also romanized as ssŭ.
In the system of weights established for customs purposes in the 18ᵗʰ century by treaties between China and the western powers, called treaty or haikwan weight, the szu was about 3.77994 milligrams.
Currently, szu (or kung szu) is the Chinese name for the milligram.
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Last revised: 9 November 2003.