U+2230 • calculus
The volume integral symbol (∮∮∮) used in calculus and mathematical analysis to denote integration over a three-dimensional volume. It extends the concept of multiple integrals to volumetric regions.
The Symbol For Volume 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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