Peta- - Wikipedia
en.wikipedia.org › wiki › Peta-Peta (/ ˈ p ɛ t ə /) is a decimal unit prefix in the metric system denoting multiplication by one quadrillion, or 10 15 (1 000 000 000 000 000).It was adopted as an SI prefix in the International System of Units in 1975, and has the symbol P.