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Three integral signs side by side, integrating over a three-dimensional region.
Also known as: Volume integral sign, Iterated triple integral
The triple integral sign says that the integration runs over a volume rather than a line or a surface. The number of integral signs is the number of variables integrated over, which is why a reader can tell the dimension of the problem before reading anything else on the line.
Denotes integration over a three-dimensional region, with one integral sign per variable of integration.
Contexts: Mathematics
Is written with three signs by convention rather than by rule: a single ∫ with a three-variable measure means the same thing, and physics texts often prefer it.
Contexts: Mathematics
Three tall elongated S-shapes, each with a curl at top and bottom, set immediately beside one another.