Peta

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

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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:

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1 petametre = 1015 metres

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1 petasecond = 1015 seconds

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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, coming from the Greek for 'monster': is from the Greek for four and so peta, coming from , misses the third letter, n, out.)

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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.

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People for the Ethical Treatment of Animals: People for the Ethical Treatment of Animals (PETA) is the largest animal rights organization in the world. Founded in 1980 as a non-profit organization, it has its headquarters in Norfolk, Virginia, and a claimed 800,000 members and over 100 employees worldwide. Outside the U.S., there are branch of...

Peta (disambiguation): Peta can mean many things:...

Physics: Physics (from the Greek, φυσικός (phusikos), "natural", and φύσις (phusis), "nature") is the science of the natural world in the broadest sense, dealing with matter and energy and the fundamental forces of nature that govern the interaction...

Peta related Images and Photos (experimental)

Peta Wilson	PETA 2012 Student Planner	PETA 2011 Student Planner	I am an Animal: The Story of Ingrid Newkirk and Peta (DVD)
Model Marcus Schenkenberg and Actress Pamela Anderson at Peta Benefit