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Exagram or exagramme is equal to 1018 gram (unit of mass), comes from a combination of the metric prefix exa (E) with the gram (g). Plural name is exagrams.
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.