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Unity  Elementary  Symmetric 
Diagonal Matrix with main diagonal elements = 1 
All elements = 0 except for a single 1 
Square Matrix with a_{ij} = a_{ji} 
Square  Diagonal  Null 
Same number of rows and columns 
Square Matrix with a_{ij} = 0 for all i_{¹} j 
All elements = 0 
Singular  
Value of determinant = 0 
Determinant 

Adjoint 
Square Matrix where aij is replaced with I, j cofactor multiplied by (1)i·j. Adjoint A = adj A 
Rank 
Rank of A = Rank of A'

Transpose 
Matrix where rows and columns are interchanged. Transpose A = A (A')' = A (kA)' = kA' (A+B)' = A'+B' (AB)' = B'A' 