Peta (prefix)

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Peta (symbol: P) is an SI prefix indicating a factor of 10¹⁵, equal to 1,000,000,000 000,000 (one thousand trillion).

Adopted in 1975, it comes from the Greek πέντε, which means five, since it is equivalent to 1000⁵. (It is based on the model of tera, which comes from the Greek 'monster': tetra- comes from the Greek word for four and thus peta, which comes from penta-, it loses the third letter, n.)

In computing, the prefix pebi is also often used, which represents 1,125,899,906,842,620 (2⁵⁰), instead of 1,000,000,000,000,000, especially when used as a byte prefix (pebibyte).

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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