Exa (English spelling) exa-
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SI prefix for 10 18 (100 quintillion) times the unit. The symbol is E. It comes from the Greek word hex. Hex means 6, but because of the custom of separating numbers by commas every three digits, it is used to mean 6 x 3 = 18, or 6 divisions. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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単位の 1018 倍 (100京倍) を表わすSI 接頭語。記号はE 。ギリシア語のヘクスに由来する。ヘクスは6を表わすが，数字を3桁ごとにカンマで区切る習慣から 6×3＝18 ，つまり6区切の意味に用いられている。
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