What is the 90% rule in trading?

Could you please elaborate on the 90% rule in trading? I'm curious to know how this principle applies in the world of cryptocurrency and finance. Could you provide an example or scenario where this rule might be utilized? Additionally, what are the potential benefits and drawbacks of adhering to the 90% rule? I'm interested in understanding its impact on risk management and overall trading performance. Thank you for your insight into this intriguing topic.