A(2, 3) refers to a specific point in a two-dimensional coordinate system, where the first number, 2, represents the x-coordinate and the second number, 3, represents the y-coordinate. This means that the point is located 2 units along the horizontal axis and 3 units along the vertical axis from the origin, which is the point (0, 0). In a Cartesian plane, points like A(2, 3) are used to identify locations and can be plotted to visualize relationships between different values. This system is fundamental in mathematics and is widely used in various fields, including geometry, physics, and engineering.