What is gold in Excel?

Excuse me, could you please elaborate on what is meant by "gold in Excel"? Is this a reference to a specific feature or function within the Excel software that I may be unaware of? As a practitioner in the fields of cryptocurrency and finance, I'm familiar with Excel's extensive capabilities for data analysis and financial modeling, but I'm not sure how the term "gold" fits into that context. Could you please provide some context or an example to help me understand this better?