A landform where a river splits into several smaller streams before flowing into the sea, often creating a triangle-shaped area of land. In science and math, it can also mean a change or difference, especially when written as the Greek letter Δ.
Named after the Greek letter *delta* (Δ), because the Nile River’s mouth looked like the triangular shape of the letter. The symbol later spread into mathematics and science to represent change or difference.
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