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Nanosecond is equal to 10-9 second (unit of time), comes from a combination of the metric prefix nano (n) with the second (s). Plural name is nanoseconds with symbol is ns.
Petasecond is equal to 1 000 000 000 000 000 second (unit of time), comes from a combination of the metric prefix peta (P) with the second (s). Plural name is petaconds with symbol is Ps.