Integrals with a circle in the middle of them

[PainDoc]

What is the symbol of an integral with a circle in the middle called? I am asking because Gauss's Law is defined to be equal to that integral of the dot product of E and dA.

 

[Hootenanny]

What is the symbol of an integral with a circle in the middle called? I am asking because Gauss's Law is defined to be equal to that integral of the dot product of E and dA.

The symbol

$$\oint_s \ldots d\mathbold{x}$$

is often used to indicate that the contour over which the integral is being taken is closed.