A relational symbol representing proportionality with variable-like styling, commonly used in physics and engineering equations.
Examples
Direct proportionality in physics
F \varpropto m \text{ (force is proportional to mass)}
Multiple proportionality relationships
T \varpropto \sqrt{L} \varpropto \frac{1}{\sqrt{g}} \text{ (pendulum period)}
Area proportionality
A \varpropto r^2 \text{ (circle area proportional to radius squared)}