| α |
Alpha |
Fine structure constant; an angle. |
| ß |
Beta |
v/c; 1/κBΤ ; an angle. |
| γ |
Gamma |
E/mc2; an angle. |
| τ |
Tau |
torque; a rate of force. |
| Τ |
Tau |
Periodic time. |
| Δ |
Delta |
'change in . . . ', as in Δx. |
| δ |
Delta |
An infinitesimal; like Δ but smaller. |
| σ |
Delta |
Cross section; areal density; conductivity. |
 |
Epsilon |
An infinitesimal quantity; permittivity. |
| e |
e |
A small energy, electron. |
| ζ |
Zeta |
A general parameter. |
| η |
Eta |
Index of refraction; a meson. |
| Θ |
Null |
An angle; Debye temperature. |
| θ |
Theta |
An angle (most common symbol). |
| κ |
Kappa |
Dielectric constant; thermal conductivity. |
| Λ |
Lambda |
A rate; a type of baryon. |
| λ |
Lambda |
Wavelength; a rate; linear density. |
| μ |
Meu |
Reduced mass; muon; prefix micro. |
| ν |
Nu |
Frequency in cycle/s (Hz); neutrino. |
| v |
Nu |
Rarely used (looks like v). |
| Ξ |
Xi |
A type of baryon. |
| ξ |
Xi |
A general parameter; coherence length. |
| Π |
Pi |
Product operator. |
| π |
Pi |
3.14159... ; pion (a meson). |
| ρ |
Rho |
Density per unit volume; resistivity. |
| Σ |
Sigma |
Summation operator. |
| Φ |
Phi |
A wave function; an angle. |
 |
Phi |
An angle; a wave function. |
| φ |
Phi |
Electrostatic potential. |
| χ |
Chi |
Susceptibility. |
| ψ |
Psi |
A wave function. |
 |
Mho |
Used as inductance. |
| Ω |
Ohm |
Solid angle; angular frequency; a baryon. |
| ω |
Omega |
Angular frequency (radian/s); a meson.
Cube root of unity. |
|
Common Greek Letters