a picosecond, 1 second x 10^-12
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One trillionth = 0.000000000001
A zetrosecond is a unit of plank time and is the shortest measurement of time ever. The simple answer is , a billionth of a trillionth of a second.
A picosecond is one-trillionth of a second. It is also one-thousandth of a nanosecond. As such there are 0.000000000001 (or 10-12) seconds in a picosecond.
a picometer
one trillionth