The expression "x²" represents a mathematical operation called squaring, where a number, denoted as x, is multiplied by itself. For example, if x is 3, then x² equals 3 × 3, which is 9. This operation is commonly used in algebra and is fundamental in various mathematical concepts, including geometry and calculus. In a graphical context, the equation y = x² describes a parabola that opens upwards. The vertex of this parabola is at the origin (0,0), and as x increases or decreases, the value of y increases, illustrating how squaring affects the output. This relationship is essential in understanding quadratic functions and their properties.