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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.
Exasecond is equal to 1018 second (unit of time), comes from a combination of the metric prefix exa (E) with the second (s). Plural name is exaconds with symbol is Es.