U+222E "∮" Contour Integral Unicode Character

U+222E "∮" Contour Integral is a mathematical symbol used to denote a line integral taken over a closed curve or contour, most frequently encountered in complex analysis and vector calculus, where it represents the integration of a function around a loop. Its design features a standard integral sign with a small circle in the center, specifically indicating that the path of integration forms a closed loop, which is essential in theorems like Cauchy's integral formula and Stokes' theorem.