The Tsu Shin Gen Kanji have the philosophic meaning, “To see with the body-eye”.

The entire body must see what cannot be seen with the eyes, and hear what cannot be heard with the ears – in other words, intuition or a sixth sense. When applied to fighting it means that one learns to be able to instinctively “read” one’s opponent. When you are fighting if you see a punch or kick coming, it is almost too late to do anything about it. You have to sense it almost before your opponent starts his move and just react - no thinking involved."