All techniques related to the Rinnegan have been titled Six Paths Techniques in reference to the Sage of Six Paths the first person with the Rinnegan the famed God of Shinobi. The Six Paths in the Sage of the Six Paths are a reference to the six paths of reincarnation in Hinduism; the Deva Path, Animal Path, Naraka Path, Preta Path, Human Path, and Asura Path. There also is a heretic Outer Path, which exists outside the other paths. Hence why the techniques of the Outer Path are kinjutsu, as well as not included in the techniques that name the Six Paths Technique.