What is the meaning of dBc?

Could you please elaborate on the significance and definition of "dBc" in the realm of cryptocurrency and finance? I've come across this term in various discussions but have been unable to find a concise yet comprehensive explanation. Is it a measure of volatility? A unit of risk? Or perhaps a specific indicator used in technical analysis? Understanding its true meaning and context within the industry would greatly aid in my comprehension of current market trends and potential investment strategies. Thank you for your assistance in clarifying this matter.