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Yoctosecond is equal to 10-24 second (unit of time), comes from a combination of the metric prefix yocto (y) with the second (s). Plural name is yoctoseconds with symbol is ys.
Centisecond is equal to 10-2 second (unit of time), comes from a combination of the metric prefix centi (c) with the second (s). Plural name is centiseconds.