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Delta (uppercase/lowercase Δ δ), is a letter of the Greek alphabet, used to represent the "d" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 4. Letters that came from it include the Roman D and Cyrillic Д.
In mathematics, the upper-case letter Δ can be used as symbol to represent "change" in a variable (e.g., [math]\Delta x[/math]). It can also be used to represent discriminant—a key algebraic expression used to determine the number of roots a polynomial has. The lower-case letter [math]\delta[/math], on the other hand, is often used to denote small quantities in proofs involving limit, a key concept on calculus is based on.
In molecular chemistry, the lower case Greek letter δ is used to represent a partial charge. This is always less than the unit charge associated with an ion, but has no real fixed value.
A river delta is so named because its shape approximates the upper-case letter delta.
- "Compendium of Mathematical Symbols" (in en-US). 2020-03-01. https://mathvault.ca/hub/higher-math/math-symbols/.