peta- (P-) 1
peta- (P-) 1 :
A metric prefix denoting 1015 (one U.S. quadrillion). One parsec, for example, equals 30.857 petameters. The prefix was chosen to suggest the Greek penta, meaning 5, this being the fifth prefix (n = 5 in 103n) in the SI system of metric prefixes. The prefix is usually pronounced pet-a, with a short "e" sound, rather than pee-ta
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