Greek Alphabet - a MaS Tutor.

Name	Upper Case	Examples of Use	Lower Case	Examples of Use
alpha	Α		α	Symbol for alpha radiation; An angle
beta	Β		β	Symbol for beta radiation
gamma	Γ		γ	Symbol for gamma radiation
delta	Δ	A change; the Discriminant $(b^{2} - 4 a c)$ in quadratics.	δ	A small change
epsilon	Ε		ε	On it's own the relative permittivity. With a zero subscript, $ε_{0}$ , it's the permittivity of free space
zeta	Ζ		ζ
eta	Η		η
theta	Θ		θ	An angle
iota	Ι		ι
kappa	Κ		κ
lambda	Λ		λ	Wavelength; Probability of decay in a given time frame
mu	Μ	-	μ	Coefficient of Fraction; $10^{-6}$ ; symbol for the muon.
nu	Ν		ν
xi	Ξ	-	ξ	the universal set.
omicron	Ο		ο
pi	Π	Product of terms	π	Almost exclusively, use for the ratio of $\frac{circumference}{diameter}$ ; Pion
rho	Ρ		ρ	Density; Resistivity
sigma	Σ	Sum of terms	σ	Stress; Standard Deviation
tau	Τ		τ	Symbol for the tauon
upsilon	Υ		υ
phi	Φ	Magnet Flux Linkage	φ	Magnetic Flux
chi	Χ		χ
psi	Ψ		ψ
omega	Ω	Ohm, unit of electrical resistance	ω	Angular speed/frequency

Greek Alphabetand some of their uses