There are so many!!!
I have mini mini orgasms lots of times, they are short, a result of being aroused for a long long time. In my opinion... they are kind of whimpy and nothing really to talk about.
Then there are clitoral orgasms, g-spot orgasms, combined. Sometimes, they are earth shattering where I just cannot see anything even with my eyes open, and it takes an age to come off that high. Then there are those that the earth trembles, it feels amazing... but usually with these I can have five or six in one session.