What is a substitute for ling?

As a cryptocurrency and finance professional, I often come across various terms and acronyms within the industry. When it comes to the phrase "substitute for ling," I'm curious to understand the context as it's not a term commonly used in our field. Could you elaborate on what "ling" refers to in this context, and what potential substitutes might exist? Understanding the nature of "ling" will help me provide a more accurate and relevant response.