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Yottameter is an SI device for measuring distance. It is equal to 1024 meters. The symbol for yottameter is Ym.
An attometer is a unit of length, a combination of the metric prefix atto (symbol a) and the SI unit of length meter (symbol m), equal to 10−18 meter or 1.0E-18 meter and its symbol is am. Plural name is attometers.