<Table> <Tr> <Td> </Td> <Td> Look up micro - in Wiktionary, the free dictionary . </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Look up micro - in Wiktionary, the free dictionary . </Td> </Tr> <P> Micro - (symbol μ) is a unit prefix in the metric system denoting a factor of 10 (one millionth). Confirmed in 1960, the prefix comes from the Greek μικρός (mikrós), meaning "small". </P> <P> The symbol for the prefix comes from the Greek letter μ (mu). It is the only SI prefix which uses a character not from the Latin alphabet . "mc" is commonly used as a prefix when the character "μ" is not available; for example, "mcg" commonly denotes a microgram . Also the letter u instead of μ is allowed by one of the ISO documents . </P>

What is the numerical value of the si prefix abbreviation μ
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