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'zetta-' (symbol 'Z') is an SI prefix in the SI (system of units) denoting 10²¹ or 1 000 000 000 000 000 000 000.
Adopted in 1991, it comes from the Latin ''septem'', meaning ''seven'', because it is equal to 1000⁷.
A prefix of the same value, 'hepa-', was informally introduced a few years before the promulgation of zetta-. It was formed from the Greek ἑπτά, ''(hepta)'', also meaning ''seven''. It never received official sanction and is now obsolete.

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See also

External link

See also

★ SI prefix

★ Binary prefix

External link

★ BIPM website