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Photonics Handbook

Greek Alphabet

Table of the Greek alphabet and what the letters are commonly used to designate.

     Name               
Capital              
Small            Commonly Used to Designate

          

Alpha               
    A              
α            Angles, coefficients, attenuation constant, absorption factor, area
          
     Beta               B           β           Angles, coefficients, phase constant, luminous intensity
     Gamma
              Γ
          γ           Complex propagation constant (cap), specific gravity, angles, electrical conductivity, propagation constant, surface tension (small)
     Delta               Δ
          δ           Increment or decrement (cap or small), determinant (cap), permittivity (cap), density, angles
        Epsilon
              Ε
          ε           Dielectric constant, permittivity, base of natural logarithms, electric intensity, emissivity
     Zeta
              Ζ           ζ           Coordinates, coefficients
     Eta               Η           η           Intrinsic impedance, efficiency, surface charge density, hysteresis, coordinates, luminous efficiency
     Theta               Θ
          θ           Angular phase displacement, time constant, reluctance, angles
     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, prefix micro, refractive index
     Nu               Ν
          ν
          Reluctivity, frequency, wavelength
     Xi               Ξ
          ξ
          Coordinates
     Omicron
              Ο
          ο          
     Pi
              Π
          π           3.1416
     Rho
              Ρ
          ρ           Resistivity, volume charge density, coordinates, reflection factor
     Sigma               Σ
          σ           Summation (cap), surface charge density, complex propagation constant, electrical conductivity, leakage coefficient, wavelength, 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           Resistance in ohms (cap), solid angle (cap), angular velocity
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