yocto- (y-)
yocto- (y-) :
A metric prefix denoting 10-24 (one septillionth). Adopted by the CGPM in 1990, the prefix is derived from the Latin octo and Greek okto, meaning 8, because this is the eighth prefix (n = 8 in 10-3n) in the SI system of metric prefixes. The y was added arbitrarily to provide a non-confusing letter for abbreviations
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