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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.
Femtosecond is equal to 10-15second (unit of time), comes from a combination of the metric prefix femto (f) with the second (s). Plural name is femseconds with symbol is fs.