IADC Code For PDC Bits & Classification Chart
The IADC PDC Drilling Bits Classification Code system, developed by the International Association of Drilling Contractors has been the representative voice of drillers worldwide since 1940. This system has enabled drillers worldwide to exchange information using standard nomenclature and dull grading methods for PDC drill bits and tricones. This system is not as widely used for PDC drill bits as it is for tricones as the IADC system for tricones is used the world over.
https://www.drillingmanual.com/classification-of-fixed-cutter-bits/