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Hectogram or hectogramme is equal to 100 gram (unit of mass), comes from a combination of the metric prefix hecto (h) with the gram (g). Plural name is hectograms.
Femtogram or femtogramme is equal to 10-15 gram (unit of mass), comes from a combination of the metric prefix femto (f) with the gram (g). Plural name is femtograms.