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Yottagram or yottagramme is equal to 1024 gram (unit of mass), comes from a combination of the metric prefix yotta (Y) with the gram (g). Plural name is yottagrams.
attogram or attogramme is equal to 10-18 gram (unit of mass), comes from a combination of the metric prefix atto (a) with the gram (g). Plural name is attograms.