Yocto-

Look up yocto- in Wiktionary, the free dictionary.

Yocto- (symbol y) is a prefix in the metric system denoting a factor of 10⁻²⁴ or 0.000000000000000000000001.

Adopted in 1991^[1] by the General Conference on Weights and Measures, it comes from the Greek οκτώ, meaning "eight", because it is equal to 1000⁻⁸. As of 2009^[update], yocto is the smallest confirmed SI prefix.

It can be used to state a subatomic particle's mass, for example:

Prefix	Symbol	1000^m	10ⁿ	Decimal	Short scale	Long scale	Since^{[n 1]}
yotta	Y	1000⁸	10²⁴	1000000000000000000000000	Septillion	Quadrillion	1991
zetta	Z	1000⁷	10²¹	1000000000000000000000	Sextillion	Trilliard	1991
exa	E	1000⁶	10¹⁸	1000000000000000000	Quintillion	Trillion	1975
peta	P	1000⁵	10¹⁵	1000000000000000	Quadrillion	Billiard	1975
tera	T	1000⁴	10¹²	1000000000000	Trillion	Billion	1960
giga	G	1000³	10⁹	1000000000	Billion	Milliard	1960
mega	M	1000²	10⁶	1000000	Million		1960
kilo	k	1000¹	10³	1000	Thousand		1795
hecto	h	1000^2/3	10²	100	Hundred		1795
deca	da	1000^1/3	10¹	10	Ten		1795
		1000⁰	10⁰	1	One		–
deci	d	1000^−1/3	10⁻¹	0.1	Tenth		1795
centi	c	1000^−2/3	10⁻²	0.01	Hundredth		1795
milli	m	1000⁻¹	10⁻³	0.001	Thousandth		1795
micro	μ	1000⁻²	10⁻⁶	0.000001	Millionth		1960
nano	n	1000⁻³	10⁻⁹	0.000000001	Billionth	Milliardth	1960
pico	p	1000⁻⁴	10⁻¹²	0.000000000001	Trillionth	Billionth	1960
femto	f	1000⁻⁵	10⁻¹⁵	0.000000000000001	Quadrillionth	Billiardth	1964
atto	a	1000⁻⁶	10⁻¹⁸	0.000000000000000001	Quintillionth	Trillionth	1964
zepto	z	1000⁻⁷	10⁻²¹	0.000000000000000000001	Sextillionth	Trilliardth	1991
yocto	y	1000⁻⁸	10⁻²⁴	0.000000000000000000000001	Septillionth	Quadrillionth	1991
^ The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.

References [link]

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