In mathematics 1  : Skew lines, lines that are neither parallel nor intersecting. 2  Skew-symmetric matrix, a square matrix whose transpose is also its negative. 3  Skew-Hermitian matrix, a complex square matrix whose conjugate transpose is also its negative.4  Infinite skew polyhedron, an extension of the concept of polyhedra. Skew-Hermitian matrix, a complex square matrix whose conjugate transpose is also its negative. 2  Infinite skew polyhedron, an extension of the concept of polyhedra. 3  Skew-symmetric graph, a directed graph that is isomorphic to its own transpose graph. 4  Skew polygon, a polygon whose vertices do not lie on a plane.