The term "m x n" refers to a mathematical expression that represents the dimensions of a rectangle or a matrix. Here, "m" indicates the number of rows, while "n" signifies the number of columns. For example, a 3 x 4 matrix has 3 rows and 4 columns, totaling 12 elements. In various fields, such as computer science and statistics, "m x n" is commonly used to describe data structures and arrays. Understanding this notation is essential for organizing information efficiently, whether in programming or mathematical calculations.