As of 2014, yocto is the smallest official SI prefix. It is equivalent to 10^24 which is septillion. 10^27 is octillion.
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No further prefixes have been defined officially after "yocto". If you need to write such extremely small numbers, just use scientific notation.
The smallest metric prefix is "yocto-" which is equal to 10^-24. It is often used in very small measurements, such as in nuclear physics.
There is no such thing as smallest unit in the metric system. For example, the official prefix for the smallest unit is "yocto-", which is one septillionth (10^-24). But measurements can go on to 10^-11 yoctometres which is the Planck length, the smallest measurable distance.
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