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Hectosecond is equal to 100second (unit of time), comes from a combination of the metric prefix hecto (h) with the second (s). Plural name is hectoseconds with symbol is hs.
Zeptosecond is equal to 10 second (unit of time), comes from a combination of the metric prefix zepto (z) with the second (s). Plural name is zeptoseconds with symbol is zs.