While Tomitsu and Daimitsu, which were transmitted systematically, are called Jun-mitsu (Pure Esoteric Buddhism), Mikkyo, which had been transmitted in fragments and had adherents before Jun-mitsu, is called Zo-mitsu (Mixed Esoteric Buddhism).
体系的に請来された東密、台密を純密というのに対し、純密以前に断片的に請来され信仰された密教を雑密という。