Δ
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Δ  Code Point 

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The capital greek letter (capital delta) is used in math to represent change. Typically, the symbol is used in an expression like this:
In plain language, this means the change in the variable .
The Greek small letter delta (δ) is used in math as a variable. It appears in calculus in epsilon delta notation.
The slope of a line is calculated by finding the change in y over the change in x using two points on the line.