Greek letters are often used in mathematics, and it’s useful to know how to read them out loud. Many of them tend to appear in standard contexts, some of which are listed here. However, some are rarely used because they look too much like Roman letters.

**Table C.1. Greek Letters and Common Mathematical Uses**

Greek Letter | English | Usage |
---|---|---|

α | Alpha | Often symbolizes an angle. |

β | Beta | Often symbolizes an angle. |

ϒ | Gamma | Often symbolizes an angle. |

Δ | Delta | An infinitesimally small number, especially in calculus. |

ε | Epsilon | An infinitesimally small number, especially in functional analysis. |

ζ | Zeta | Occasionally symbolizes an angle. |

η | Eta | Occasionally symbolizes an angle. |

θ | Theta | Usually symbolizes an angle. |

ι | Iota | Rarely used. |

к | Kappa | Rarely used. |

λ | Lambda | The symbol ... |

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