|Triquetra Demon Seal|
|Literal English||Triquetra Demon Seal|
The Triquetra Demon Seal is the seal that keeps the Nine-Tailed Demon Fox sealed inside of Kaito Hiroki. Unlike Naruto's seal, this seal was created specifically to seal the Nine-Tails. It works similarly to Naruto's own Four Symbols Seal, blending in small amounts of the Nine-Tail's Chakra with Kaito's own chakra.
After Kaito seperated the Fox' chakra from it's will, the seal upgraded, but fundamentally remained the same seal. Now, the seal's appearance takes the of one of the Sage of the Six Paths' magatama beads, as well as the Triquetra design that resembled the symbol of Uzushiogakure, appearing on his Nine-Tails Chakra Mode shroud. In Kaito's mindscape, the world takes the form of a submerged forest, with the Kyūbi sealed in a "cage" of durable trees, completely with another barrier surrounding it, and then a third.