Orthagonalia

The line segments AB and CD are orthogonal to each other.

Orthagonalia is a festival devoted to the mathematics of orthagonality.

In mathematics, orthogonality is the relation of two lines at right angles to one another (perpendicularity), and the generalization of this relation into n dimensions; and to a variety of mathematical relations thought of as describing non-overlapping, uncorrelated, or independent objects of some kind.

The concept of orthogonality has been broadly celebrated in the mathematics of pilgrimage, as well as in areas such as chemistry and poetry.