The Positive Axis Point (PAP) is probably the most important piece of information on a bowling ball that you can’t see. It can’t be marked by the manufacturer, because it depends on the bowler. It is the point around which the ball rotates after the release. Think of a tire, the axis is always the same, because of the two dimensional nature of the tire. But on a bowling ball, your release dictates how much side roll and forward roll the bowling ball has.
Most drilling layouts today reference the PAP. You layout your bowling ball by placing the pin a predetermined distance from your PAP. But if your PAP is different from mine, the pin may end up in drastically different location.