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Yottasecond is equal to 1024 second (unit of time), comes from a combination of the metric prefix yotta (Y) with the second (s). Plural name is yottaseconds with symbol is Ys.
Decisecond is equal to 10-1 second (unit of time), comes from a combination of the metric prefix deci (d) with the second (s). Plural name is deciseconds.