U+222F • mathematics
The symbol '∮∮' (Surface Integral) represents integration over a surface in three-dimensional space, used in vector calculus and physics to compute flux and other surface-related quantities. It generalizes the integral operator to two-dimensional manifolds.
The Symbol For Surface Integral (∯) is a unicode character in the Basic Multilingual Plane Plane. It is found in the Mathematical Operators block and was approved as part of Unicode Version 1.1 in 1993
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