What is the difference between DX and δx?

Could you please elaborate on the distinction between DX and δx? I'm curious to understand the fundamental differences between these two terms, especially in the context of cryptocurrency and finance. Do they represent different concepts, or do they have overlapping meanings? Could you provide some examples or scenarios where one might be used over the other? Additionally, how important is it to understand the difference between DX and δx for professionals in the cryptocurrency and finance industry?