# Practical Electronics/Greek Alphabet

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Greek letters are often used in electronics, either for prefixes or to represent values, often if the normal letters run out.

Letter | Name | Uses | |
---|---|---|---|

Capital | Lowercase | ||

Α | α | Alpha | |

Β | β | Beta | |

Γ | γ | Gamma | |

Δ | δ | Delta | |

Ε | ε | Epsilon | |

Ζ | ζ | Zeta | |

Η | η | Eta | |

Θ | θ | Theta | Generally used to denote angles or phase relationships |

Ι | ι | Iota | |

Κ | κ | Kappa | |

Λ | λ | Lambda | Usually used for wavelength, but can also be used to denote an arbitrary constant. |

Μ | μ | Mu | Lowercase stands for "micro-", the prefix denoting one millionth. Can also be used to denote an arbitrary constant, usually when λ has been used already. |

Ν | ν | Nu | |

Ξ | ξ | Xi | |

Ο | ο | Omicron | |

Π | π | Pi | Lowercase denotes a mathematical constant, 3.14... |

Ρ | ρ | Rho | Lowercase can mean resistivity (not resistance) or density. |

Σ | σ | Sigma | Capital denotes the sum of a series of values. |

Τ | τ | Tau | PI multiplied by two (6.2831...) |

Υ | υ | Upsilon | |

Φ | φ | Phi | Sometimes used for angles or phase relationships, if theta has already been used. Can also represent the Golden Ratio. |

Χ | χ | Chi | |

Ψ | ψ | Psi | |

Ω | ω | Omega | Capital denotes "ohms", the unit of resistance. Lowercase can mean the "angular speed" or the rate of change of phase of a signal. |