Commonly Used Greek Letters in Subjects

Commonly Used Greek Letters in Subjects

Lower case

Capital

Name $\alpha\;$ $\Alpha\;$alphaAngular acceleration
Linear expansion
Coefficient
Alpha particle (helium nucleus)
Fine Structure Constant $\beta\;$ $\Beta\;$betaBeta particle — high energy electron
Sound intensity $\gamma\;$ $\Gamma\;$gammaGamma ray (high energy EM wave)
Ratio of heat capacities (in an ideal gas)
Relativistic correction factor $\delta\;$ $\Delta\;$deltaΔ="Change in"
δ="Infinitessimal change in" $\epsilon\;$ $\Epsilon\;$epsilonEmissivity
Strain
Permittivity
EMF $\zeta\;$ $\Zeta\;$zeta(no common use) $\eta\;$ $\Eta\;$etaViscosity
Energy efficiency $\theta\;$ $\Theta\;$thetaAngle (°, rad)
Temperature $\iota\;$ $\Iota\;$iotaThe lower case $\iota\;$ is rarely used, while $\Iota\;$ is sometimes used for the identity matrix or the moment of inertia. Note that $\iota\;$ is not to be confused with the Roman character i; (which has a dot and is much more widely used in mathematics and physics). $\kappa\;$ $\Kappa\;$kappaSpring constant
Dielectric constant $\lambda\;$ $\Lambda\;$lambdaWavelength
Thermal conductivity
Constant
Eigenvalue of a matrix
Linear density $\mu\;$ $\Mu\;$muCoefficient of friction
Electrical mobility
Reduced mass
Permeability $\nu\;$ $\Nu\;$nuFrequency $\xi\;$ $\Xi\;$xiDamping cofficient $o\;$ $O\;$omicron(no common use) $\pi\;$ $\Pi\;$piProduct symbol Π
Circle number π: = 3.14159... $\rho\;$ $\Rho\;$rhoVolume density
Resistivity $\sigma\;$ $\Sigma\;$sigmaSum symbol
Boltzmann constant
Electrical conductivity
Uncertainty
Stress
Surface density $\tau\;$ $\Tau\;$tauTorque
Tau particle (a lepton)
Time constant $\upsilon\;$ $\Upsilon\;$upsilon(pending) $\phi\;$ $\Phi\;$phiMagnetic/electric flux $\chi\;$ $\Chi\;$chiRabi frequency (lasers) $\psi\;$ $\Psi\;$psiWave function $\omega\;$ $\Omega\;$omegaOhms (unit of electrical resistance)