What is the Japanese symbol for bond?

Could you please clarify for me, what exactly is meant by the "Japanese symbol for bond"? Is there a specific character or symbol in the Japanese language that is commonly associated with the concept of a bond, such as a financial instrument that represents a debt obligation? Or is this a reference to a more figurative or cultural symbol that embodies the idea of connection or unity, which might be perceived as analogous to the concept of a bond? If the former, I'm not aware of a dedicated Japanese symbol for bonds in the financial sense. If the latter, the answer may vary depending on the specific context and interpretation.