The numerical notations you see refer to a direction. If you look at the keypad on your computer keyboard, That will indicate what direction is being portrayed.
For example maxis 6A+B BE means (forward X+Y A+B+K) as you can see its much easier to use the numerical notations rather than write all that stuff out all the time.
I took the liberty of reposting the notation conventions thread in my soul arena, but I removed some of the stuff from older games that would just confuse newcomers, like soul charge cancel, etc.