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yocto- (symbol y) is an SI prefix in the SI system of units denoting a factor of 10−24 or 0.000 000 000 000 000 000 000 001.

Adopted in 1991, it comes from the Greek οκτώ, meaning eight, because it is equal to 1/10008. As of 2007, yocto- is the smallest SI prefix to be confirmed.

It can be used for measuring a subatomic particle's mass, for example:

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