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Zettagram or zettagramme is equal to 1021 gram (unit of mass), comes from a combination of the metric prefix zetta (Z) with the gram (g). Plural name is zettagrams.
centigram or centigramme is equal to 10-1 gram (unit of mass), comes from a combination of the metric prefix centi (c) with the gram (g). Plural name is centigrams.