The Greek Alphabet

There are 24 letters in the Greek alphabet:

Upper Case Letter	Lower Case Letter	Name	English Name
Α	α	Άλφα	Alpha
Β	β	Βήτα	Beta
Γ	γ	Γάμμα	Gamma
Δ	δ	Δέλτα	Delta
Ε	ε	Έψιλον	Epsilon
Ζ	ζ	Ζήτα	Zeta
Η	η	Ήτα	Eta
Θ	θ	Θήτα	Theta
Ι	ι	Ιώτα	Iota
Κ	κ	Κάππα	Kappa
Λ	λ	Λά(μ)βδα	Lambda
Μ	μ	Μυ	Mi
Ν	ν	Νυ	Ni
Ξ	ξ	Ξι	Ksi
Ο	ο	Όμικρον	Omicron
Π	π	Πι	Pi
Ρ	ρ	Ρώ	Rho
Σ	σ/ς	Σίγμα	Sigma
Τ	τ	Ταυ
Υ	υ	Ύψιλον	Upsilon
Φ	φ	Φι	Fi
Χ	χ	Χι	Chi
Ψ	ψ	Ψι	Psi
Ω	ω	Ωμέγα	Omega

Note that there are two forms of the lower case letter Σίγμα (σ, ς). The second form is only used when it occurs at the end of a word, the first is used everywhere else.