(linear algebra) A square matrix whose columns, considered as vectors, are orthonormal to each other. This implies that the transpose of such a matrix is also its inverse.

(linear algebra) A matrix (of dimension n×m) that represents some linear transformation from ℝᵐ→ℝⁿ.

(biochemistry) Any structural protein

plural of transformation matrix

(linear algebra) A transformation matrix whose associated transformation is a projection.

A two-dimensional barcode

plural of data matrix

plural of incidence matrix

(mathematics) Any block diagonal matrix whose blocks are Jordan blocks.

plural of matrix decomposition