Zeta

Letters that arose from zeta include the Roman Z and Cyrillic З.

The word zeta is the ancestor of zed, the name of the Latin letter Z in Commonwealth English.

The letter ζ represents the voiced alveolar fricative IPA: [z] in Modern Greek.

agree on attributing to it the pronunciation /zd/ (like Mazda), but some scholars believe that it was an affricate /dz/ (like adze).

Ἔτι δὲ τῶν συμφώνων διπλᾶ μέν ἐστι τρία· ζ ξ ψ. διπλᾶ δὲ εἴρηται, ὅτι ἓν ἕκαστον αὐτῶν ἐκ δύο συμφώνων σύγκειται, τὸ μὲν ζ ἐκ τοῦ σ καὶ δ, τὸ δὲ ξ ἐκ τοῦ κ καὶ σ, τὸ δὲ ψ ἐκ τοῦ π καὶ σ.