Kuji-kiri is an esoteric practice which; when performed with an array of hand 'seals' (kuji-in); was meant to allow ninja to enact superhuman feats. The kuji ('nine characters') is a concept originating from Taoism; where it was a string of nine words used in charms and incantations.

Intended effects range from physical and mental concentration; to more incredible claims about rendering an opponent immobile; or even the casting of magical spells. These legends were captured in popular culture; which interpreted the kuji-kiri as a precursor to magical acts. Pictures From History