Capital letters:

Code Name	Code	Description	Symbol / Character
Α	Α	Greek capital letter alpha	Α
Β	Β	Greek capital letter beta	Β
Γ	Γ	Greek capital letter gamma	Γ
Δ	Δ	Greek capital letter delta	Δ
Ε	Ε	Greek capital letter epsilon	Ε
Ζ	Ζ	Greek capital letter zeta	Ζ
Η	Η	Greek capital letter eta	Η
Θ	Θ	Greek capital letter theta	Θ
Ι	Ι	Greek capital letter iota	Ι
Κ	Κ	Greek capital letter kappa	Κ
Λ	Λ	Greek capital letter lambda	Λ
Μ	Μ	Greek capital letter mu	Μ
Ν	Ν	Greek capital letter nu	Ν
Ξ	Ξ	Greek capital letter xi	Ξ
Ο	Ο	Greek capital letter omicron	Ο
Π	Π	Greek capital letter pi	Π
Ρ	Ρ	Greek capital letter rho	Ρ
Σ	Σ	Greek capital letter sigma	Σ
Τ	Τ	Greek capital letter tau	Τ
Υ	Υ	Greek capital letter upsilon	Υ
Φ	Φ	Greek capital letter phi	Φ
Χ	Χ	Greek capital letter chi	Χ
Ψ	Ψ	Greek capital letter psi	Ψ
Ω	Ω	Greek capital letter omega	Ω

Small letters:

Code Name	Code	Description	Symbol / Character
α	α	Greek small letter alpha	α
β	β	Greek small letter beta	β
γ	γ	Greek small letter gamma	γ
δ	δ	Greek small letter delta	δ
ε	ε	Greek small letter epsilon	ε
ζ	ζ	Greek small letter zeta	ζ
η	η	Greek small letter eta	η
θ	θ	Greek small letter theta	θ
ι	ι	Greek small letter iota	ι
κ	κ	Greek small letter kappa	κ
λ	λ	Greek small letter lambda	λ
μ	μ	Greek small letter mu	μ
ν	ν	Greek small letter nu	ν
ξ	ξ	Greek small letter xi	ξ
ο	ο	Greek small letter omicron	ο
π	π	Greek small letter pi	π
ρ	ρ	Greek small letter rho	ρ
σ	σ	Greek small letter sigma	σ
τ	τ	Greek small letter tau	τ
υ	υ	Greek small letter upsilon	υ
φ	φ	Greek small letter phi	φ
χ	χ	Greek small letter chi	χ
ψ	ψ	Greek small letter psi	ψ
ω	ω	Greek small letter omega	ω

In code blocks:

ψ | ψ | Greek small letter psi | ψ |                                                                         
ω | ω | Greek small letter omega | ω |