The Japanese “chic".

Isn't it all about one's identity and beliefs within a pattern?

Originally, it was a stylized washer for a tool for pulling out a nail that had been driven in.

"Pull out the nail" = "Pull out the nine castles"

It seems that, leads to a successful career by capturing many castles

"Pull out the nail" = "Pull out the pain"

As a symbol of protecting  yourself from evil.

Wear it with various combination daily.