Γγ ⟵ {\displaystyle \longleftarrow } 4 ⟶ {\displaystyle \longrightarrow } Εε Pronunciation IPA (key): /ˈdɛltə/ or [ˈdɛɫtə] Audio (US)(file) Noun Singular delta Plural deltas Fourth letter of Greek. Δδ. The Simple English Wikipedia has an article on: Delta Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads