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Yocto (symbol y) is a SI prefix in the SI system of units denoting a factor of 10-24.

Adopted in 1991, it comes from the Greek όχτώ, meaning eight, because it is equal to 1/10008.

SI prefixes

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(Sub)multiple Prefix Symbol Short scale Name Long scale Name
1024 yotta Y Septillion Quadrillion
1021 zetta Z Sextillion Thousand trillion (Trilliard)
1018 exa E Quintillion Trillion
1015 peta P Quadrillion Thousand billion ( Billiard)
1012 tera T Trillion Billion
109 giga G Billion Thousand million ( Milliard)
106 mega M Million
103 kilo k Thousand
102 hecto h Hundred
101 deca da Ten
10-1 deci d Tenth
10-2 centi c Hundredth
10-3 milli m Thousandth
10-6 micro µ Millionth
10-9 nano n Billionth Milliardth
10-12 pico p Trillionth Billionth
10-15 femto f Quadrillionth Billiardth
10-18 atto a Quintillionth Trillionth
10-21 zepto z Sextillionth Trilliardth
10-24 yocto y Septillionth Quadrillionth



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Topics: Yoctosecond, Yoctometre, Yoctogram...

YoctoYocto (symbol y is a SI prefix in the SI system of units denoting a factor of 10-24. Adopted in 1991, it comes from the Greek , meaning eight because it is equal to 1/10008. See also SI prefixes SI prefixes.YoctosecondA yoctosecond is an SI unit of time equal to one septillionth (10-24) of a second. The word yoctosecond is formed by the prefix yocto and the unit second''. Its symbol is ys . See also 1 E-24 s for a list of times on the order of 1-10 yoctoseconds SI deriYoctometreYoctometre ( American spelling: yoctometer is an SI measure of length that is equal to 10-24 ( yocto) of a metre. Its symbol is ym . 1 ym 1 × 10-24 metre Planck length << yoctometre << zeptometre SI derived units of length.
YoctogramThe prefix -yocto is used to to multiply the coifficient 10^-24 to the value of of a physical quantity. Which means that 1 yoctogram equals 1 10^-24 grams. The other prefixes that are used to demote small and large values are given below: Higher Prefixes:  
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