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Delta (letter) - Wikipedia
Delta ( / ˈdɛltə /; [1] uppercase Δ, lowercase δ or 𝛿; Greek: δέλτα, délta, [ˈðelta]) [2] is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter dalet 𐤃. [3] Letters that come from delta include Latin D and Cyrillic Д .