A AxBxC layout is most likely referring to a Dual Angle Layout. Example: 30° X 3.5" X 45°
The Dual Angle Layout Technique uses three measurements:
A-The Drilling Angle: Affects the length of the skid phase of the ball, when it goes into a roll.
example:
A 10° drilling technique will roll the soonest of all the effective drilling angles.
A 90° drilling technique will roll the latest of all the effective drilling angles.
B-The Pin to Positive Axis Point (Pin-to-PAP) distance
The Pin to PAP distance affects the percentage of the flare potential available.
C-The Vertical Axis Line (VAL) angle
The Angle to the VAL affects how quickly the ball transitions through the hook phase of the ball.
You can read more here:
DUAL_ANGLE_LAYOUT_TECHNIQUE.pdf
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