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