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An zeptometer is a unit of length, a combination of the metric prefix zepto (symbol z) and the SI unit of length meter (symbol m), equal to 10−21 meter or 1.0E-21 meter and its symbol is zm. Plural name is zeptometers.
Zettameter is an SI device for measuring distance. It is equal to 1021 meters. The symbol for zettameter is Zm.