A lowercase Greek letter commonly used to represent angles, curves, mathematical constants, or functions in analysis and physics.
Examples
Angle in trigonometry
\sin^2 \gamma + \cos^2 \gamma = 1
Euler's constant in number theory
\gamma \approx 0.57721 \text{ (Euler-Mascheroni constant)}
Path parameterization in calculus
\gamma(t) = (\cos t, \sin t), \quad 0 \leq t \leq 2\pi