Delta, often represented by the Greek letter Δ, signifies change or difference in various fields such as mathematics, science, and finance. In mathematics, it indicates the difference between two values, like the change in temperature or distance. In finance, Δ can represent the change in the price of an asset, helping investors understand market movements. In the context of science, Δ is used to describe changes in physical states, such as the transition from solid to liquid. Similarly, in statistics, it can denote the difference between observed and expected values, aiding in data analysis and interpretation.