What does the delta notation (Δ) commonly represent in mathematics?

Delta notation (Δ) commonly signifies a change or difference in mathematics. It is frequently used to represent the difference between two values, such as in calculus where Δx indicates a change in the variable x, or Δy represents a change in the variable y. This notation is especially prevalent when discussing derivatives, rates of change, or in situations where one is measuring the difference between an initial state and a subsequent state.

For instance, in physics when dealing with motion, Δt may denote the change in time between two events. The concept of "change" is essential in many areas of mathematics, science, and engineering, reflecting how quantities vary or shift in relation to one another. This is why delta is such a critical component in mathematical expressions relating to difference and change, confirming that A is the correct representation of its meaning.