What is the 8 4 3 rule of compounding?

Could you elaborate on the concept of the 8 4 3 rule of compounding? I've heard it mentioned in the context of cryptocurrency investments and finance, but I'm not quite sure how it works. Specifically, I'm interested in understanding how the numbers 8, 4, and 3 come into play and how they relate to the principles of compounding interest. Is it a guideline for investment strategies? A formula to calculate returns? Or is it simply a mnemonic device to remember key principles? Clarifying this would be greatly appreciated.