Missing Integral Notation

[DeepSeeded]

I can't find a description for the Integral notation with a circle in the middle and sometimes a letter in it I think. I do not see any mention of it on wikipedia or in my calc classes. There it is ----> \oint :bugeye:

[Crosson]

http://en.wikipedia.org/wiki/Line_integral

[DeepSeeded]

http://en.wikipedia.org/wiki/Line_integral


Oh, a closed line interval. Got it thanks!!