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Peta

For the bread, see: pita.
Peta (symbol: P) is a prefix in the SI system of units denoting 1015, or 1 000 000 000 000 000.
In computer science peta can 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.
PETA is an organization: People for the Ethical Treatment of Animals