<Tr> <Th_colspan="2"> SI prefixes <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Th> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <Tr> <Td> <Table> <Tr> <Th_colspan="2"> Prefix </Th> <Th> Base 1000 </Th> <Th> Base 10 </Th> <Th> Decimal </Th> <Th_colspan="2"> English word </Th> <Th> Adoption </Th> </Tr> <Tr> <Th> Name </Th> <Th> Symbol </Th> <Th> Short scale </Th> <Th> Long scale </Th> </Tr> <Tr> <Td> yotta </Td> <Td> Y </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000000000000 </Td> <Td> septillion </Td> <Td> quadrillion </Td> <Td> 1991 </Td> </Tr> <Tr> <Td> zetta </Td> <Td> Z </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000000000 </Td> <Td> sextillion </Td> <Td> trilliard </Td> <Td> 1991 </Td> </Tr> <Tr> <Td> exa </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000000 </Td> <Td> quintillion </Td> <Td> trillion </Td> <Td> </Td> </Tr> <Tr> <Td> peta </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000 </Td> <Td> quadrillion </Td> <Td> billiard </Td> <Td> </Td> </Tr> <Tr> <Td> tera </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000 </Td> <Td> trillion </Td> <Td> billion </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> giga </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000 </Td> <Td> billion </Td> <Td> milliard </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> mega </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000 </Td> <Td_colspan="2"> million </Td> <Td> 1873 </Td> </Tr> <Tr> <Td> kilo </Td> <Td> k </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000 </Td> <Td_colspan="2"> thousand </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> hecto </Td> <Td> h </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 100 </Td> <Td_colspan="2"> hundred </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> deca </Td> <Td> da </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 10 </Td> <Td_colspan="2"> ten </Td> <Td> 1795 </Td> </Tr> <Tr> <Td_colspan="2"> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> </Td> <Td_colspan="2"> one </Td> <Td>--</Td> </Tr> <Tr> <Td> deci </Td> <Td> d </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.1 </Td> <Td_colspan="2"> tenth </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> centi </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.01 </Td> <Td_colspan="2"> hundredth </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> milli </Td> <Td> m </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.001 </Td> <Td_colspan="2"> thousandth </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> micro </Td> <Td> μ </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 001 </Td> <Td_colspan="2"> millionth </Td> <Td> 1873 </Td> </Tr> <Tr> <Td> nano </Td> <Td> n </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 001 </Td> <Td> billionth </Td> <Td> milliardth </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> pico </Td> <Td> p </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 001 </Td> <Td> trillionth </Td> <Td> billionth </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> femto </Td> <Td> f </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 001 </Td> <Td> quadrillionth </Td> <Td> billiardth </Td> <Td> 1964 </Td> </Tr> <Tr> <Td> atto </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 000 001 </Td> <Td> quintillionth </Td> <Td> trillionth </Td> <Td> 1964 </Td> </Tr> <Tr> <Td> zepto </Td> <Td> z </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 000 000 001 </Td> <Td> sextillionth </Td> <Td> trilliardth </Td> <Td> 1991 </Td> </Tr> <Tr> <Td> yocto </Td> <Td> y </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 000 000 000 001 </Td> <Td> septillionth </Td> <Td> quadrillionth </Td> <Td> 1991 </Td> </Tr> <Tr> <Td_colspan="8"> </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Prefix </Th> <Th> Base 1000 </Th> <Th> Base 10 </Th> <Th> Decimal </Th> <Th_colspan="2"> English word </Th> <Th> Adoption </Th> </Tr> <Tr> <Th> Name </Th> <Th> Symbol </Th> <Th> Short scale </Th> <Th> Long scale </Th> </Tr> <Tr> <Td> yotta </Td> <Td> Y </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000000000000 </Td> <Td> septillion </Td> <Td> quadrillion </Td> <Td> 1991 </Td> </Tr> <Tr> <Td> zetta </Td> <Td> Z </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000000000 </Td> <Td> sextillion </Td> <Td> trilliard </Td> <Td> 1991 </Td> </Tr> <Tr> <Td> exa </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000000 </Td> <Td> quintillion </Td> <Td> trillion </Td> <Td> </Td> </Tr> <Tr> <Td> peta </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000000 </Td> <Td> quadrillion </Td> <Td> billiard </Td> <Td> </Td> </Tr> <Tr> <Td> tera </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000000 </Td> <Td> trillion </Td> <Td> billion </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> giga </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000000 </Td> <Td> billion </Td> <Td> milliard </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> mega </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000000 </Td> <Td_colspan="2"> million </Td> <Td> 1873 </Td> </Tr> <Tr> <Td> kilo </Td> <Td> k </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 1000 </Td> <Td_colspan="2"> thousand </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> hecto </Td> <Td> h </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 100 </Td> <Td_colspan="2"> hundred </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> deca </Td> <Td> da </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 10 </Td> <Td_colspan="2"> ten </Td> <Td> 1795 </Td> </Tr> <Tr> <Td_colspan="2"> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> </Td> <Td_colspan="2"> one </Td> <Td>--</Td> </Tr> <Tr> <Td> deci </Td> <Td> d </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.1 </Td> <Td_colspan="2"> tenth </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> centi </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.01 </Td> <Td_colspan="2"> hundredth </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> milli </Td> <Td> m </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.001 </Td> <Td_colspan="2"> thousandth </Td> <Td> 1795 </Td> </Tr> <Tr> <Td> micro </Td> <Td> μ </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 001 </Td> <Td_colspan="2"> millionth </Td> <Td> 1873 </Td> </Tr> <Tr> <Td> nano </Td> <Td> n </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 001 </Td> <Td> billionth </Td> <Td> milliardth </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> pico </Td> <Td> p </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 001 </Td> <Td> trillionth </Td> <Td> billionth </Td> <Td> 1960 </Td> </Tr> <Tr> <Td> femto </Td> <Td> f </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 001 </Td> <Td> quadrillionth </Td> <Td> billiardth </Td> <Td> 1964 </Td> </Tr> <Tr> <Td> atto </Td> <Td> </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 000 001 </Td> <Td> quintillionth </Td> <Td> trillionth </Td> <Td> 1964 </Td> </Tr> <Tr> <Td> zepto </Td> <Td> z </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 000 000 001 </Td> <Td> sextillionth </Td> <Td> trilliardth </Td> <Td> 1991 </Td> </Tr> <Tr> <Td> yocto </Td> <Td> y </Td> <Td> 1000 </Td> <Td> 10 </Td> <Td> 0.000 000 000 000 000 000 000 001 </Td> <Td> septillionth </Td> <Td> quadrillionth </Td> <Td> 1991 </Td> </Tr> <Tr> <Td_colspan="8"> </Td> </Tr> </Table>

In the metric system the prefix micro- denotes