The expression "k^2" represents the square of a variable or number "k." Squaring a number means multiplying it by itself. For example, if k equals 3, then k^2 equals 3 × 3, which is 9. This concept is fundamental in mathematics and is often used in various fields, including physics and engineering. In geometry, k^2 can represent the area of a square with side length k. The formula for the area of a square is A = side × side, so if each side is k, the area becomes k^2. Understanding this relationship helps in solving problems related to geometry and algebra.