Variable
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x or any other variable
In mathematics, a symbol that represents an unknown quantity is typically denoted by a variable, such as "x" or "y". These variables are used to represent values that are not yet known or are subject to change. They are commonly used in algebraic equations to solve for the unknown quantity based on given information or conditions.
The symbol is called DELTA and looks like a triangle. -----> Δ <----
A variable
a variable