What is phoenix money?

Excuse me, could you please clarify what you mean by "phoenix money"? Is it a specific type of cryptocurrency, or perhaps a new financial instrument that I'm not familiar with? Could you elaborate on its origins, purpose, and any unique features that set it apart from other forms of digital money? Additionally, I'm curious to know if it's widely accepted, regulated, and how secure it is for transactions. I'm eager to learn more about this intriguing concept you've mentioned.