Ji'in

慈陰

Ji'in 慈陰 ("Inverted Mercy") is important for the execution of many simultaneous techniques and the often-repeated stances, enabling swift changes of direction while maintaining balance, power and steps of equal length. It has, however, been removed from the Japan Karate Association teaching and grading syllabus.

https://en.wikipedia.org/wiki/Jion_kata_group