Commonly Used Greek Letters in Subjects

                                                       
                                              Commonly Used Greek Letters in Subjects

Lower case	Capital	Name
		alpha	Angular acceleration Linear expansion Coefficient Alpha particle (helium nucleus) Fine Structure Constant
		beta	Beta particle — high energy electron Sound intensity
		gamma	Gamma ray (high energy EM wave) Ratio of heat capacities (in an ideal gas) Relativistic correction factor
		delta	Δ="Change in" δ="Infinitessimal change in"
		epsilon	Emissivity Strain Permittivity EMF
		zeta	(no common use)
		eta	Viscosity Energy efficiency
		theta	Angle (°, rad) Temperature
		iota	The lower case  is rarely used, while  is sometimes used for the identity matrix or the moment of inertia. Note that  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	Spring constant Dielectric constant
		lambda	Wavelength Thermal conductivity Constant Eigenvalue of a matrix Linear density
		mu	Coefficient of friction Electrical mobility Reduced mass Permeability
		nu	Frequency
		xi	Damping cofficient
		omicron	(no common use)
		pi	Product symbol Π Circle number π: = 3.14159...
		rho	Volume density Resistivity
		sigma	Sum symbol Boltzmann constant Electrical conductivity Uncertainty Stress Surface density
		tau	Torque Tau particle (a lepton) Time constant
		upsilon	(pending)
		phi	Magnetic/electric flux Angle (°, rad)
		chi	Rabi frequency (lasers) Susceptibility
		psi	Wave function
		omega	Ohms (unit of electrical resistance) ω Angular velocity