What is a GFI button?

Could you elaborate on the concept of a GFI button and its significance in the financial and cryptocurrency sectors? I'm particularly interested in understanding its function, potential applications, and any unique challenges it poses for investors or traders. Additionally, I'd appreciate any insights you have regarding its recent popularity or if it's a new trend in the industry. My curiosity lies in grasping how this button could potentially impact financial transactions and decision-making in today's digital economy.