"Katsu"

"Katsu" is a Buddhist term.
A cry used in Zen Buddhism to show the activity of the mind that is difficult to express in language and letters, or to scold, shout at, and guide the practitioner.
In modern times, it is a word used to mean scolding encouragement.
However, this "Katsu" was expressed with the message that everyone should wake up in their own various thoughts.