Zetta
Zetta (symbol Z ) is a Préfixe of the international system (IF) which represents 1021, that is to say thousand billion billion.
Adopted in 1991, it comes from French seven , because equal to 10007.
Few sizes use this prefix, but one will notice the Zetta-particle S whose rest mass is measured in ZeV (zetta-electron-volts).
See too
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