When Japanese called "KAOU" is translated literally, "KA"is a meaning called a flower. "OU" means that it pushes.The form of kaou was produced from the form of a flower.KAOU is a kind of the sign written instead of the signature.It was used in order to prove that the text which generals wrote individually is original.kaou is made based on a real name.It was used for the beginning as substitution of a signature of the government aristocrat of a Heian era.Samurai also came to use KAOU behind.