Its a quadrillionth of a unit (3 more zeros than a trillion has)
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A femto is in metric prefix terms a quadrillionth, whereas a centimeter is a hundredth. The femto was added in 1964 and was derived from the word femten meaning 'fifteen'.
femto.femto.femto.femto.
what does key mean in math
figure math means figure math
the mean (in math) is the average of all the numbers in the problem