Zetta

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Zetta (symbol Z) is an SI prefix indicating a factor of 10²¹ (one thousand trillion).

Adopted in 1991, it comes from the Latin septem, which means seven, as it is equivalent to 1000⁷.

A prefix of the same value, Hepa, was introduced informally some years before the promulgation of zetta. It was formed from the Greek επτά («heptá»), which also means seven». It never received official acceptance and is now considered outdated.

In computing, zetta can mean 2⁷⁰, instead of 10²¹, especially when used as a byte prefix (zettabyte).

1000ⁿ	10ⁿ	Prefix	Symbol	Short scale	Long scale	Decimal equity in the prefixes of the International System	Allocation
1000¹⁰	10³⁰	quetta-	Q	Nonillion	Quintillón	1 000 000 000 000 000 000 000 000	2022
1000⁹	10²⁷	ronna-	R	Eighth	Mil cuatrillones	1 000 000 000 000 000 000 000 000	2022
1000⁸	10²⁴	Yotta-	And	Septillion	Cuatrillón	1 000 000 000 000 000 000 000	1991
1000⁷	10²¹	zetta-	Z	Sextillion	A thousand trillions	1 000 000 000 000 000 000	1991
1000⁶	10¹⁸	exa...	E	Quintillón	Trillion	1 000 000 000 000 000 000	1975
1000⁵	10¹⁵	peta...	P	Cuatrillón	A billion.	1 000 000 000 000 000	1975
1000⁴	10¹²	tera-	T	Trillion	Billion	1 000 000 000 000	1960
1000³	10⁹	giga-	G	Billion	billion / billion	1 000 000 000	1960
1000²	10⁶	mega-	M	Million		1 000	1960
1000¹	10³	kilo-	k	Mil / Millar		1 000	1795
1000^2/3	10²	Hecto-	h	Hundred / Hundred		100	1795
1000^1/3	10¹	deca-	da	Ten / Ten		10	1795
1000⁰	10⁰	No prefix		One / Unit		1
1000^−1/3	10⁻¹	deci-	d	Tenth		0.1	1795
1000^−2/3	10⁻²	centi-	c	Centésimo		0.01	1795
1000⁻¹	10⁻³	mili-	m	A thousandth		0.001	1795
1000⁻²	10⁻⁶	micro-	μ	Millions		0.000 001	1960
1000⁻³	10⁻⁹	nano-	n	Billionth	One billion dollars	0.000 000 001	1960
1000⁻⁴	10⁻¹²	peak...	p	Trillonéimo	Billionth	0.000 000 000 001	1960
1000⁻⁵	10⁻¹⁵	femto-	f	Cuatrillonésimo	Milbillonésimo	0.000 000 000 000 001	1964
1000⁻⁶	10⁻¹⁸	Atto-	a	Quintillonésimo	Trillonéimo	0.000 000 000 000 000 000 001	1964
1000⁻⁷	10⁻²¹	zepto-	z	Sextillonésimo	Miltrillonésimo	0.000 000 000 000 000 000 000 001	1991
1000⁻⁸	10⁻²⁴	Icto-	and	Septillonésimo	Cuatrillonésimo	0.000 000 000 000 000 000 000 000 000 001	1991
1000⁻⁹	10⁻²⁷	red.	r	Eighth.	Milcuatrillonésimo	0.000 000 000 000 000 000 000 000 000 000 001	2022
1000⁻¹⁰	10⁻³⁰	Quecto-	q	Nonillonésimo	Quintillonésimo	0.000 000 000 000 000 000 000 000 000 000 000 001	2022

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