An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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zetta-
  زتا-  
zetta-
Fr.: zetta-  

A prefix of the → SI units, denoting 1021. Symbol: Z.

See also: From L. septem, → hepta-, by replacing the initial s with z to distinguish from → zepto-.
It is equal to 10007.