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Decasecond is equal to 10second (unit of time), comes from a combination of the metric prefix deca (da) with the second (s). Plural name is decaseconds with symbol is das.
Terasecond is equal to 1 000 000 000 000 second (unit of time), comes from a combination of the metric prefix tera (T) with the second (s). Plural name is teraseconds with symbol is Ts.