“Tsuba” is the hand guard of a katana (japanese sword). If every katana has a soul, then I believe tsuba is the heart of it. Even the sharpest katana has a tsuba that defines its user.
![A tsuba depicts wheels in water. [R]](http://sertalpbilal.com/blog-eng/wp-content/uploads/Heianj41.jpg)
A tsuba depicts wheels in water. [R]
A tsuba depicts wheels in water. [R]