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平常心 is the title Heijoshin, as associated with Kendo and Aikido schools of Japanese martial arts.
平常心 is also a word in Japanese that can be translated as “one's self-possession” or “presence of mind.”
In Chinese and Korean, this means “simplicity heart,” “composure,” “calmness,” or a “sense of orderliness.” In Chinese and Korean, this implies that you enjoy what you have, keep your heart in balance, and have no over-blown ambitions.