This is the fūinjutsu used by Naruto to seal the Kyūbi into Tamamo. The seal itself takes the form of the kanji for “one-self” (自, Shi) and is printed on Tamamo’s spine. Not much else is known about the seal; besides that it surprisingly enough did not subdue the bijū, which allowed the beast to possess the body after Naruto’s inevitable death. * Naruto successfully sealed the whole strength of the Kyūbi with this seal into the current vessel.