Determine the order of the matrix. \[ \left[\begin{array}{rrr} -8 & -6 & 3 \\ 4 & -6 & 7 \\ -2 & -8 & -8 \end{array}\right] \] What is the order of the matrix?

Step 1 ：The order of a matrix is defined as the number of rows and columns it has. It is represented as 'm x n' where 'm' is the number of rows and 'n' is the number of columns.

Step 2 ：In this case, we can see that the matrix has 3 rows and 3 columns.

Step 3 ：Therefore, the order of the matrix is 3 x 3.

Step 4 ：Final Answer: The order of the matrix is \(\boxed{3 \times 3}\).