The Greek alphabet was developed around 1000 BCE based on the Phoenician's North Semitic Alphabet. It contains 24 letters including seven vowels, and all of its letters are capitals . The uppercase and lowercase forms of the 24 letters are :

- Α α (alpha)
- Β β (beta)
- Γ γ (gamma)
- Δ δ (delta)
- Ε ε (epsilon)
- Ζ ζ (zeta)
- Η η (eta)
- Θ θ (theta)
- Ι ι (iota)
- Κ κ (kappa)
- Λ λ (lambda)
- Μ μ (mu)
- Ν ν (nu)
- Ξ ξ (xi)
- Ο ο (omicron)
- Π π (pi)
- Ρ ρ (rho)
- Σ σ/ς (sigma)
- Τ τ (tau)
- Υ υ/ϒ ϒ (upsilon)
- Φ φ (phi)
- Χ χ (chi)
- Ψ ψ (psi)
- Ω ω (omega)

Here are some websites that discuss How Many Letters In The Greek Alphabet:
1. https://www.thoughtco.com/letters-of-greek-alphabet-118638
2. https://greekletter.org/how-many-letters-are-there-in-the-greek-alphabet/
3. https://en.wikipedia.org/wiki/Greek_alphabet
4. https://www.britannica.com/topic/Greek-alphabet

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