Some matrices, by their characteristics, receive special denominations. Array row: Array of type 1 x n, that is, with a single row. For example, the matrix A = [4 7 -3 1], type 1 x 4. Column matrix: matrix type m x 1, that is, with a single column. For example, of type 3 x 1 Square Array: Array of type n x n, that is, with the same number of rows and columns; we say that the matrix is of order n.