What do these symbol mean? I always see these symbols and others like it when looking at really advanced maths. I have yet to learn anything about it. I was wondering if someone could explain briefly what they are used for.
$$\oint \quad\iint \quad \iiint$$
 A: The first is Contour Integral
The second and third are double and triple integrals
A: The $\oint$ is called line integral 

The terms path integral, curve integral, and curvilinear integral are also used; contour integral as well, although that is typically reserved for line integrals in the complex plane.

using it we take perimeter instead of area in contrast to $\int$. This finds great use in physics (ampere circuital law)
The $\iint$ it is the definite integral of 2 variables $f(x,y)$ can be used to take Volume of 3-D figures . There is also a line integral version of double integral called Surface integral this calculates surface area.
The $\iiint$ it is the definite integral of 3 variables $ f(x,y,z)$ can be used to take volume of a 4 D figure( wow!)

Read about line integrals here http://en.m.wikipedia.org/wiki/Line_integral
A: The first denotes a closed integral. Its meaning varies a little based on context, but the best way to think of it is that the set of points over which you are integrating is closed and bounded (like integrating over the circumference of a circle or the outside of a sphere). There might be a little bit of contention with the leftmost one since physicists kind of co-opted the notation. A mathematician might be tempted to say that it is a closed contour or line integral (integrating over a closed curve) but in physics, the notation is also used for flux integrals like in Maxwell's equations. The only way to be $100\%$ sure what is meant is to look at what kind of infinitesimal notation is used ($dl$ versus $dS$).
The latter two have very specific meaning: the middle symbol denotes a double integral, i.e. there are two integration variables, and the rightmost symbol denotes a triple integral, i.e. there are three integration variables.
