# Letters in the Greek Alphabet and their Uses

### - summary of letters in the Greek alphabet and their uses in science, electronics, radio and technology.

The Greek alphabet is widely used to demote various constants and values within the scientific and technology arenas. These Greek letters are used for everything from the values of resistance and resistivity, through to impedance, permeance and ratios of circles and much more.

There are only 24 letters in the Greek alphabet in comparison to the 26 in the widely used Latin script used in much of the world today. The letters in the Greek alphabet also have different symbols used to denote them, although the Greek alphabet does have capitals and small versions of each letter.

A table of the different letters, symbols and what they are commonly used to designate is given below:

Greek letter | Greek symbol | Used to denote | |
---|---|---|---|

Capital | Small | ||

Alpha | Α | α | Angles, coefficients, attenuation constant, absorption factor, area |

Beta | Β | β | Angles, coefficients, phase constant |

Gamma | Γ | γ | Complex propagation constant (cap), specific gravity, angles, electrical conductivity, propagation constant |

Delta | Δ | δ | Incrment or decrement, determinant (cap), permittivity (cap), density, angles |

Epsilon | Ε | ε | Dielectric constant, permittivity, electric intensity |

Zeta | Ζ | ζ | Coordinates, coefficients |

Eta | Η | η | Intrinsic impedance, efficiency, surface charge density, hysteresis, coordinates |

Theta | Θ | θ | Angular phase displacement, angles, time constant, reluctance |

Iota | Ι | ι | Unit vector |

Kappa | Κ | κ | Susceptibility, coupling coefficient, thermal conductivity |

Lambda | Λ | λ | Permeance (cap), wavelength, attenuation constant |

Mu | Μ | μ | Permeability, amplification factor (in valves/ vacuum tubes), prefix for the micro multiplier. |

Nu | Ν | ν | Reluctivity, frequency |

Xi | Ξ | ξ | Coordinates |

Omicron | Ο | ο | |

Pi | Π | π | Universally used for 3.1416 . . . . |

Rho | Ρ | ρ | Resistivity, volume charge density, coordinates |

Sigma | Σ | σ | Summation (cap), surface charge density, complex propagation constant, electrical conductivity, leakage coefficient, deviation |

Tau | Τ | τ | Time constant, volume resistivity, time-phase displacement, transmission factor, density |

Upsilon | Υ | υ | |

Phi | Φ | φ | Scalar potential (cap), magnetic flux, angles |

Chi | Χ | χ | Electric susceptibility, angles |

Psi | Ψ | ψ | Dielectric flux, phase difference, coordinates, angles |

Omega | Ω | ω | Electrical resistance (cap), solid angle, angular velocity |

**Note:** The small Greek letter in the alphabet is used except where the notation (cap) is used where the capital version of the Greek letter is used.

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