What is Tatiana's 3 Body Problem?

Excuse me, could you please elaborate on the term "Tatiana's 3 Body Problem"? I'm curious to know if it refers to a specific mathematical or cryptographic challenge related to blockchain or cryptocurrency, or if it's a metaphorical concept used in the finance industry. Additionally, I'd appreciate it if you could provide some context or background information to help me better understand the significance and implications of this problem. Thank you.