zetta-
prefix/ˈzɛt.ə-/
Etymology Coined with Latin septem (“seven”) and Ancient Greek ἑπτᾰ́ (heptắ, “seven”) in mind, for the seventh order of 10³. The consonants pt are reduced to tt; the initial z was chosen instead of s to avoid confusion with s (“second”, symbol)
1
Morpheme In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10²¹ (a short scale sextillion or long scale trilliard).