from Wiktionary, Creative Commons Attribution/Share-Alike License.
- prefix In the
International System of Unitsand other metricsystems of units, multiplying the unitto which it is attached by 10−24. Symbol: y
from Wiktionary, Creative Commons Attribution/Share-Alike License
Ancient Greek ὀκτώ (oktō, "eight"), for the eighth order of 10−3. The letter y was added, as the second term in a series running backwards through the alphabet.
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