Εε ⟵ {\displaystyle \longleftarrow } 6 ⟶ {\displaystyle \longrightarrow } Ηη Pronunciation (UK) IPA (key): /ˈziː.tə/ (US) IPA (key): /ˈzeɪtə/ Audio (US)(file) Noun Singular zeta Plural zetas Sixth letter of Greek. Ζζ. The Simple English Wikipedia has an article on: Zeta Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads