Square matrix

Diagonal matrix

scalar matrix

Identity matrix

Lower triangluar matrix

A matrix in which the number of rows is equal to the number of columns

A square matrix, all of whose elements, except those in the leading diagonal are zero

A diagonal matrix in which all the leading diagonal elements are same

A square matrix in which elements in the leading diagonal are all “1” and rest are all zero

A square matrix in which all the entries above the leading diagonal are zero