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Answer» What is Yocto mean? Yocto (symbol y) is a unit prefix in the metric system denoting a factor of 10−24 or 0.000000000000000000000001. It was adopted in 1991 by the General Conference on Weights and Measures. It comes from the Ancient Greek οκτώ, meaning "eight", because it is equal to 1000−8. Yocto- is the smallest official SI prefix. It can be used to state a subatomic particle's mass, for example: reference
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