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Picosecond is equal to 10-12second (unit of time), comes from a combination of the metric prefix pico (p) with the second (s). Plural name is picoseconds with symbol is ps.
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.