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Square zeptometre or Square zeptometer is a SI prefixes applied unit of area, symbol zm2, is a multiple of the of SI prefixes (zepto) used with the metre.
The are (/ˈɑːr/ or /ˈɛər/) is a unit of area, equal to 100 square metres (10 m × 10 m), used for measuring land area. It was defined by older forms of the metric system, but is now outside of the modern International System of Units (SI).