<prompt> The most common type of fingerprint isLoopArchCompositeWhorl  <response>: Loop 2.15-P According to Quetlets Rules Commonest is loop 67 and least is composite 1-2 Order - Loop Whorl 25 Arches 6-7 Composite For the purpose of primary classification of criminal work. Arches are included under loops and composites under whorls. 