Iron Armour Seal

Iron Armour Seal is the fūinjutsu used by Kumogakure to seal Gyūki into its respective hosts. 
== Usage ==
The seal itself takes the form of the kanji for and is usually printed somewhere on the jinchūriki's body: Killer B's right shoulder, and Blue B's chest.Naruto: Shippūden episode 318 Not much else is known about the seal, besides the fact that it was stated by B to be of lower quality and weaker than the Four Symbols Seal, which was used to seal Kurama inside of Naruto Uzumaki.Naruto chapter 496, page 7
== Trivia ==
* In the manga, the seal is depicted as being black. In the anime however, the seal is blue.
* In the anime, the Five Elements Unseal appears to be strong enough to break the Iron Armour Seal.
== References ==
de:Tekkou Fuuin
es:Sello de Armadura de Hierro
fr:Sceau d'Armure de Fer
it:Sigillo dell'Armatura di Ferro
pl:Tekkō Fūin
pt-br:Selo da Armadura de Ferro