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zeptogram or zeptogramme is equal to 10-21 gram (unit of mass), comes from a combination of the metric prefix zepto (z) with the gram (g). Plural name is zeptograms.
Teragram or teragramme is equal to 1012 gram (unit of mass), comes from a combination of the metric prefix tera (T) with the gram (g). Plural name is teragrams.