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A grain is a unit of measurement of mass, and, for the troy grain, equal to exactly 64.79891 milligrams. It is nominally based upon the mass of a single seed of a cereal.
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.