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yoctogram or yoctogramme is equal to 10-24 gram (unit of mass), comes from a combination of the metric prefix yocto (y) with the gram (g). Plural name is yoctograms.
milligram or milligramme is equal to 10-3 gram (unit of mass), comes from a combination of the metric prefix milli (m) with the gram (g). Plural name is milligrams.