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A data matrix bar code is used on almost very product which is found in stores. The data matrix bar code is used to identify a product and find the price in a computer system.
If n is a natural number and M is a matrix, then Mn denotes the matrix M multiplied by itself n times. We can include n=0, but that is just the identity matrix. So the power of a matrix is very similar to the exponents that are used for numbers.
Use the column matrix, [ -1 ] [ 3 ]
It looks like that's part of the definition of a unitary matrix. See related link, below.
ya yes its there a matrix called zero matrix