atypical bipolar disorder

How many types of bipolar disorder exist?
Hi, I have done much research on bipolar disorder, as I'm quite sure I have that although not atypical, and I'm waiting to be evaluated psychologically for it. I wonder how many guys there, because while a lot of things I've read are unclear, they say things like bipolar disorder and I know someone with bipolar I disorder, but a rapid thermal cycler, although they are supposed to be different types. Lol yeah so it's a little confusing.
there are 4 all types are explained in this link. http://www.bipolar.com/what_is_bipolar/types_of_bipolar_disorder.html
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