Peta (English spelling) peta-
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The SI prefix for 10 15 (1000 trillion) times the unit. The symbol is P. It comes from the Greek word pente. Pente means 5, but because of the custom of separating numbers by commas every three digits, it is used to mean 5 x 3 = 15, that is, a division of five. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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単位の 1015 倍 (1000兆倍) を表わすSI接頭語。記号は P 。ギリシア語のペンテに由来する。ペンテは5を表わすが，数字を3桁ごとにカンマで区切る習慣から 5×3＝15 ，つまり5区切りの意味に用いられている。
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