What is the delta change rate?

Excuse me, could you please elaborate on the concept of the "delta change rate" in the realm of cryptocurrency and finance? I'm intrigued to understand how it's calculated, and what specific insights or implications it holds for market analysis and investment strategies. Additionally, is there a standard method for determining the delta change rate across different cryptocurrencies, or does it vary based on individual assets and market conditions? Your insights would be greatly appreciated.