Capital Delta Symbol
The capital greek letter delta (Δ) is used in mathematics to represent the change in a variable. For example, Δx would be read as "the change in x".
Format  Display  Data 

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Unicode  Δ 

Usage
Slope  Notation
Slope is denoted as the change in y over the change in x. The capital greek letter delta (Δ) is used to represent the change in a variable.