Greek Alphabet and Its Engineering Uses
Name 
UPPER CASE 
lower case 
Engineering Usage Definition 
Alpha 
Α 
α 
Absorption factor, angles, angular acceleration, attenuation constant, commonbase currentamplification factor, deviation of state parameter, temperature coefficient of resistance, thermal expansion coefficient, thermal diffusivity 
Beta 
Β 
β 
Angles, commonemitter current amplification factor, flux density, phase constant, wavelength constant 
Gamma 
Γ 
γ 
Electrical conductivity, Grueneisen parameter 
Delta 
Δ 
δ 
Angles, damping coefficient (decay constant), decrement, increment, secondary emission ratio 
Epsilon 
Ε 
ε 
Capacitivity, dielectric coefficient, electric field intensity, electron energy, emissivity, permittivity, base of natural logarithms (2.7128) 
Zeta 
Ζ 
ζ 
Coefficients, coordinates, impedance 
Eta 
Η 
η 
Chemical potential, dielectric susceptibility (intrinsic capacitance), efficiency, hysteresis, intrinsic impedance of a medium, intrinsic standoff ratio 
Theta 
Θ 
θ 
Angle of rotation, angles, angular phase displacement, reluctance, thermal resistance, transit angle 
Iota 
Ι 
ι 
Inertia 
Kappa 
Κ 
κ 
Coupling coefficient, susceptibility 
Lambda 
Λ 
λ 
Line density of charge, permanence, photosensitivity , wavelength 
Mu 
Μ 
μ 
Amplification factor, magnetic permeability, micron, mobility, permeability, prefix micro 
Nu 
Ν 
ν 
Reflectivity 
Xi 
Ξ 
ξ 
Output coefficient 
Omicron 
Ο 
ο 

Pi 
Π 
π 
Peltier coefficient, ratio of circumference to diameter (3.1416) 
Rho 
Ρ 
ρ 
Reflection coefficient, reflection factor, resistivity, volume density of electric charge 
Sigma 
Σ 
σ 
Conductivity, StefanBoltzmann constant, summation, surface density of charge 
Tau 
Τ 
τ 
Period, propagation constant, Thomson coefficient, time constant, timephase displacement, transmission factor 
Upsilon 
Υ 
υ 
Admittance 
Phi 
Φ 
φ 
Angles, coefficient of performance, contact potential, magnetic flux, phase angle, phase displacement, radiant flux 
Chi 
Χ 
χ 
Angles 
Psi 
Ψ 
ψ 
Angles, dielectric flux, displacement flux, phase difference 
Omega 
Ω 
ω 
Angular frequency, angular velocity, Ohms, resistance, solid angle 