\varDeltaThe symbol \varDelta represents the uppercase Greek letter Delta. It is commonly used in mathematics and science to denote a change or difference in a certain quantity, such as a change in temperature, pressure, or any other measurable variable. In the context of calculus, it often signifies a finite difference.
Represents the change in the variable x between two points.
\varDelta x = x_2 - x_1Denotes the change in temperature from an initial state to a final state.
\varDelta T = T_{final} - T_{initial}Used in calculus to represent the change in the function value as x changes by \varDelta x.
\varDelta y = f(x+\varDelta x) - f(x)