Jisho

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Prefix
1. yocto-; 10^-24
Wikipedia definition
2. Yocto-Yocto- (symbol y) is a prefix in the metric system denoting a factor of 10 or 0.000000000000000000000001. Adopted in 1991 by the General Conference on Weights and Measures, it comes from the Greek οκτώ, meaning "eight", because it is equal to 1000. As of 2009, yocto is the smallest confirmed SI prefix.
Read “Yocto-” on English Wikipedia
Read “ヨクト” on Japanese Wikipedia
Read “Yocto-” on DBpedia

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