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Delta (letter)
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<p>Delta is the fourth letter of the <a href="/facts/Greek_alphabet/1cHwB8Dg">Greek alphabet</a>. In the system of <a href="/facts/Greek_numerals/vTLzPG0W">Greek numerals</a>, it has a value of four. It was derived from the <a href="/facts/Phoenician_alphabet/Vr4smuYg">Phoenician letter</a> <a href="/facts/Dalet_(letter)/0twlfWSk">dalet</a> 𐤃. Letters that come from delta include the <a href="/facts/Latin_alphabet/pqWVHpBz">Latin</a> <a href="/facts/D/A6hNvmCp">D</a> and the <a href="/facts/Cyrillic_script/0btN3oWC">Cyrillic</a> <a href="/facts/De_(Cyrillic)/6rMjENW9">Д</a>. </p><p>A <a href="/facts/River_delta/fmWuaRqX">river delta</a> (originally, the <a href="/facts/Nile_Delta/ItjnDeVk">delta</a> of the <a href="/facts/Nile_River/vGoXVUFH">Nile River</a>) is named so because its shape approximates the triangular uppercase letter delta. Contrary to a popular legend, this use of the word <i>delta</i> was not coined by <a href="/facts/Herodotus/hTgRSAnv">Herodotus</a>. </p>