+Delta (Δ, δ) is the fourth letter of the [Greek alphabet](/wiki/Greek_alphabet), a symbol often representing change or difference. It also names the fertile, triangular landform created at a river's mouth, where sediment deposits shape new earth, a [river delta](/wiki/River_delta).
+## See also
+- [Greek Letters](/wiki/Greek_Letters)
+- [River](/wiki/River)
+- [Symbol](/wiki/Symbol)
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