Test students' ability to recall definitions and basic properties of identity, diagonal, symmetric, skew-symmetric, orthogonal, and permutation matrices. Assess recognition of defining equations (e.g., I, diagonal structure, A^T=A, A^T=-A, A^T A=I), immediate consequences such as zeros on the diagonal of skew-symmetric matrices, simple determinant/invertibility observations (e.g., orthogonal det = ±1, diagonal invertible iff diagonal entries nonzero), and identification of examples and non-examples. Scope: introductory undergraduate, low-computation short-answer and concept-recognition items.