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Kilosecond is equal to 1000second (unit of time), comes from a combination of the metric prefix kilo (k) with the second (s). Plural name is kiloseconds with symbol isks.
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.