Uppercase Letter | Lowercase Letter     | Name | Sound
A     | a | alpha | a
B     | β |     beta | b
┌     | γ     | gamma | g
Δ     | δ |    delta | d
E     | ε     | epsilon | e
Z     | ζ |    zeta | dz
H     | η     | eta | e
Θ     | θ |    theta | th
I     | ι     | iota | i
K     | κ     | kappa | c, k
Λ     | λ | lambda | l
M     | μ      | mu | m
N     | ν |    nu |n
≡     | ξ     | xi | x
O     | ο     | omicron |o
Π     | π | pi |p
P     | p     | rho |r
Σ     | ς / σ     | sigma |s
T     | τ     | tau |t
Y     | υ     | upsilon |y, u
Φ     | φ      | phi |f, ph
X     | χ     | chi |ch
Ψ     | ψ      | psi | ps
Ω     | ω     |omega |aw

Tip: wewe only use "ς" at the end of a word if it's in the middle of a word wewe would use "σ".
Examples:
"Μήνιν άειδε θεά, Πηλειάδεω Αχηλήος ουλομένην, ή μυρί' Αχαιοίς άλγε' έθηκε."
Which means: "O, Muse, sing of Achiles' great wrath, that brought unnumbered woes upon the Greeks."