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"Shingan-ryū…柳生心眼流  is a traditional school of Japanese martial arts. Different schools of Shingan-ryū, such as Heihojutsu and Taijutsu, assert different founders, but they all go back to Ushū Tatewaki (羽州 帯刀), referred to in some historical scrolls as Shindō Tatewaki, who taught a system based on Sengoku-period battlefield tactics, that was called Shindō-ryū.
The word shingan 心眼 is rooted in Zen philosophy, and was chosen to describe a fundamental concept of the style. Shingan means "mind’s eye," or "heart's eye," and refers to the ability to sense an opponent's thoughts or feelings via an inner sense.
Shingan-ryū was created to be a battlefield art with a large comprehensive curriculum of weapons, and grappling techniques for use both while armored and unarmored. The techniques of Shingan-ryū were therefore designed to eliminate an enemy quickly and effortlessly. In the early days, both the Shingan and Shinkage schools were similar, as both consisted of an array of armed and unarmed combat techniques. However, as the two schools evolved, the Shinkage-ryū focused primarily on swordsmanship (kenjutsu), whereas the Shingan-ryū continued as a comprehensive combat system, training several arts, including jujutsu, quarterstaff fighting (bōjutsu), glaive fighting." 

source wikipedia;