In Taiwan, 20th century, a unit of mass, = 1 milligram.¹ Also romanized as kung ssŭ.
In pinyin transliteration this would be gōngsī, a word that has many meanings having to do with corporations, not weight. The usual term for a milligram is háokè 毫克.
1. United Nations, 1966.
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Last revised: 14 October 2017.