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In China, 20ᵗʰ century, a unit of area, ¹⁰⁰⁰⁰⁄₉ square meters (about 1111.11 square meters), which is a square yin. In pinyin, we surmise this would be fāngyǐn, but have not found it in any dictionaries.
United Nations, 1966.
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Last revised: 14 March 2017.