Question

How do I type the integral symbol?

Answer 1

Alt 244 =⌠

Alt 245 =⌡

So, you're going to hit "Alt", then over to the side of your keyboard, you should see groups of numbers. Not the numbers above your letters, but the ones on to the side. While pressing "Alt", you're going to hit either 244, or 245.

I hope I helped :)