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- prefix In the
International System of Unitsand other metricsystems of units, multiplying the unitto which it is attached by 1024. Symbol: Y
from Wiktionary, Creative Commons Attribution/Share-Alike License
Ancient Greek ὀκτώ (oktō, "eight"), for the eighth order of 103. The consonants ct are reduced to tt as in Italian, by analogy with peta-; the final a conforms to the finals vowel of the SI series from mega- upwards; the letter y was added, as the second term in a series running through the alphabet backwards (from zetta-).
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