While studying engineering or any subject in which we perform calulation in power of 10 then, we come across the terms like

**“micro”, “gega”, “milli”**and symbol like**“µ, n”**etc. You might know about this, but let us learn more terms like yotta, exa, petta etc. This terms are known as SI prefixes or metric prefixes. Each prefix has a unique symbol that is prepended to the unit symbol.According to International system of units specifies 20 different SI prefixes or Metric prefixes :Here is the table for 20 different prefixes with their symbol and value.

Prefixes | Symbol | Value |
---|---|---|

yotta | Y | 10^{24} |

zetta | Z | 10^{21} |

exa | E | 10^{18} |

petta | P | 10^{15} |

tera | T | 10^{12} |

giga | G | 10^{9} |

mega | M | 10^{6} |

killo | k | 10^{3} |

hecto | h | 10^{2} |

deca | da | 10^{1} |

- | 1 – one | 10^{0} |

deci | d | 10^{-1} |

centi | c | 10^{-2} |

milli | m | 10^{-3} |

micro | µ | 10^{-6} |

nano | n | 10^{-9} |

pico | p | 10^{-12} |

femto | f | 10^{-15} |

atto | a | 10^{-18} |

zepto | z | 10^{-21} |

yocto | y | 10^{-24} |