What is the 20/30 rule?

Excuse me, could you please clarify what the 20/30 rule refers to in the context of cryptocurrency and finance? I'm a bit unfamiliar with this term and would appreciate it if you could elaborate on its significance and how it applies to our field. Is it a strategy for managing risk, investing, or perhaps something else entirely? I'm eager to learn more about this rule and how it can potentially benefit those involved in cryptocurrency and finance.