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Two integral signs side by side, integrating over an area.
Also known as: Area integral, Iterated integral, Surface integral sign, Multiple integral
Two integral signs mean integration over a two-dimensional region, and three mean a volume. The count of signs is the count of dimensions, which is the whole of the notation's rule and is often left unstated.
Denotes integration over a two-dimensional region, with a third sign added for a volume and more for higher dimensions.
Contexts: Mathematics
Uses the number of signs to state the number of dimensions being integrated over, which is why the count is never decorative.
Contexts: Mathematics
Two tall S-shaped strokes set side by side, followed by the expression being integrated.