Abby, I don't know what it typical.......I know I (the pitcher) am throwing the ball so spin orientation I describe is has always been from the pitchers prospective.........
If I hold the ball in front of me, pointing it toward the catcher thumb up fingers down, my thumb represents the top of the clock and my fingers the bottom.......
But like I said rotation is not 2 dimensional..........
Example.......If I throw a ball with my thumb slightly to the left of TDC (top dead center), and my fingers are pulling straight up the back, I'm still getting close to 6-12 spin, but the axis is turned slightly left instead of straight down the power line.......
But if I turn my thumb even more left and my fingers are swiping more up the side of the ball, I'm getting more like 4-10 or 5-11 spin.........or what I call more of a "tumble spin"........
A bullet spin pitch from my prospective is one that I see rotating almost purely clock-wise from my prospective.........or counter clockwise from the catchers prospective.........