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Information about Peta

This article describes the SI prefix. For other meanings, including People for the Ethical Treatment of Animals, see Peta.


In physics and mathematics, peta- (symbol: P) is a prefix in the SI (system of units) denoting 1015, or 1 000 000 000 000 000. For example:

1 petametre = 1015 metres

1 petasecond = 1015 seconds

Adopted in 1975, it comes from the Greek πέντε, meaning five, because it is equal to 10005. It is based on the model of tera- (from Greek τέρας = 'monster', but looking like tetra- from the Greek for "four" with a letter missing), and so peta-, coming from penta-, omits the third letter, n.

In computer science peta- can sometimes mean 1 125 899 906 842 624 (10245 or 250), instead of 1 000 000 000 000 000, especially when used to prefix the byte, giving a petabyte. To resolve this ambiguity, the term pebibyte has been suggested to mean 250 bytes. However, this term is not yet widely used.

SI prefixes
1000n 10n Prefix Symbol Short scale Long scale Decimal equivalent in SI writing style
100081024yotta-YSeptillionQuadrillion1 000 000 000 000 000 000 000 000
100071021zetta-ZSextillionTrilliard (thousand trillion)1 000 000 000 000 000 000 000
100061018exa-EQuintillionTrillion1 000 000 000 000 000 000
100051015peta-PQuadrillionBilliard (thousand billion)1 000 000 000 000 000
100041012tera-TTrillionBillion1 000 000 000 000
10003109giga-GBillionMilliard (thousand million)1 000 000 000
10002106mega-MMillion1 000 000
10001103kilo-kThousand1 000
10002/3102hecto-hHundred100
10001/3101deca-daTen10
10000100(none)(none)One1
1000−1/310−1deci-dTenth0.1
1000−2/310−2centi-cHundredth0.01
1000−110−3milli-mThousandth0.001
1000−210−6micro-Millionth0.000 001
1000−310−9nano-nBillionthMilliardth0.000 000 001
1000−410−12pico-pTrillionthBillionth0.000 000 000 001
1000−510−15femto-fQuadrillionthBilliardth0.000 000 000 000 001
1000−610−18atto-aQuintillionthTrillionth0.000 000 000 000 000 001
1000−710−21zepto-zSextillionthTrilliardth0.000 000 000 000 000 000 001
1000−810−24yocto-ySeptillionthQuadrillionth0.000 000 000 000 000 000 000 001

See also

External links

People for the Ethical Treatment of Animals (PETA) is an animal rights organization based in the United States. With 1.8 million members and supporters, PETA claims to be the largest animal rights group in the world.
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Peta can refer to:
  • peta-, an SI prefix denoting a factor of 1015
  • People for the Ethical Treatment of Animals (PETA), an animal-rights organization
  • People Eating Tasty Animals, a parody of People for the Ethical Treatment of Animals

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Physics is the science of matter[1] and its motion[2][3], as well as space and time[4][5] —the science that deals with concepts such as force, energy, mass, and charge.
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Mathematics (colloquially, maths or math) is the body of knowledge centered on such concepts as quantity, structure, space, and change, and also the academic discipline that studies them. Benjamin Peirce called it "the science that draws necessary conclusions".
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An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple.
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Si, si, or SI may refer to (all SI unless otherwise stated):

In language:
  • One of two Italian words:
  • sì (accented) for "yes"
  • si

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common units, but have now been mostly replaced by the metric system in commercial, scientific, and industrial applications.

Contrarily, however, U.S. customary units are still the main system of measurement in the United States.
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This list compares various sizes of positive numbers, including counts of things, dimensionless numbers and probabilities.



Smaller than 10-36

  • Computing: The number 510-324

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1 metre =
SI units
1000 mm 0 cm
US customary / Imperial units
0 ft 0 in
The metre or meter[1](symbol: m) is the fundamental unit of length in the International System of Units (SI).
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1 metre =
SI units
1000 mm 0 cm
US customary / Imperial units
0 ft 0 in
The metre or meter[1](symbol: m) is the fundamental unit of length in the International System of Units (SI).
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To help compare orders of magnitude of different times this page lists times between 1015 seconds (a petasecond) and 1016 seconds (32 million years and 320 million years) See also times of other orders of magnitude.
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second (SI symbol: s), sometimes abbreviated sec., is the name of a unit of time, and is the International System of Units (SI) base unit of time.

SI prefixes are frequently combined with the word second to denote subdivisions of the second, e.g.
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19th century - 20th century - 21st century
1940s  1950s  1960s  - 1970s -  1980s  1990s  2000s
1972 1973 1974 - 1975 - 1976 1977 1978

Year 1975 (MCMLXXV
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Greek}}} 
Writing system: Greek alphabet 
Official status
Official language of:  Greece
 Cyprus
 European Union
recognised as minority language in parts of:
 European Union
 Italy
 Turkey
Regulated by:
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Tera- (symbol: T) is a prefix in the SI system of units denoting 1012, or 1,000,000,000,000 (1 million million).

Confirmed in 1960, it comes from the Greek τέρας, meaning monster.
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Computer science, or computing science, is the study of the theoretical foundations of information and computation and their implementation and application in computer systems.
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byte (pronounced /baɪt/) is a unit of measurement of information storage, most often consisting of eight bits. In many computer architectures it is a unit of memory addressing.
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petabyte (derived from the SI prefix peta- ) is a unit of information or computer storage equal to one quadrillion bytes. It is commonly abbreviated PB. When used with byte multiples, the prefix may indicate a power of either 1000 or 1024, so the exact number may be
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pebibyte (a contraction of peta binary byte) is a unit of information or computer storage, abbreviated PiB.

1 pebibyte = 250 bytes = 1,125,899,906,842,624 bytes = 1,024 tebibytes

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byte (pronounced /baɪt/) is a unit of measurement of information storage, most often consisting of eight bits. In many computer architectures it is a unit of memory addressing.
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An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple.
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The long and short scales are two different numerical systems used throughout the world:

Short scale is the English translation of the French term échelle courte.

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The long and short scales are two different numerical systems used throughout the world:

Short scale is the English translation of the French term échelle courte.

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decimal (base ten or occasionally denary) numeral system has ten as its base. It is the most widely used numeral system, perhaps because humans have four fingers and a thumb on each hand, giving a total of ten digits over both hands.
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yotta- (symbol Y) is an SI prefix in the SI (system of units) denoting 1024 or 1 000 000 000 000 000 000 000 000.

Adopted in 1991, it comes from the Greek ὀκτώ (októ), meaning
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Quadrillion may mean either of the two numbers (see long and short scales for more detail):
  • 1,000,000,000,000,000 (one thousand million million; ; SI prefix peta) - increasingly common meaning in English language usage.

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zetta- (symbol Z) is an SI prefix in the SI (system of units) denoting 1021 or 1 000 000 000 000 000 000 000.

Adopted in 1991, it comes from the Latin septem, meaning seven, because it is equal to 10007.
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This section needs additional to facilitate its .
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