1st position- sitting in the saddle.
second position- same as 2 point, used for jumping smaller fences, few inches out of the saddle, leaning forward a bit.
third position- seat barely out of the saddle, towards the back of the saddle. I believe this is similar to the half seat (not too sure on this one).
four position- almost jockey style

. Out of the saddle, seat to the very back of the saddle, upperbody very forward.
five position- standing straight up in the saddle, knees slightly bent, upperbody tall and straight.
This is how i've always known them as, since i started riding I was taught them.
edit: bleh, sorry everyone, just realized how stupid a question i've asked. Seems that i haven't phrased it right and no one knows what it is..though i'm SURE that someone must have an idea of what i'm talking about.