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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.
Microsecond is equal to 10-6 second (unit of time), comes from a combination of the metric prefix micro (µ) with the second (s). Plural name is microseconds with symbol is µs.