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What (who) is orthogonal table - definition

Orthogonal coordinate system; Orthogonal coordinate

Orthogonal polynomials

SET OF POLYNOMIALS WHERE ANY TWO ARE ORTHOGONAL TO EACH OTHER

Orthogonal polynomial; Orthogonal polynomials/Proofs; Orthogonal polynomials/proofs; Orthonormal polynomial

In mathematics, an orthogonal polynomial sequence is a family of polynomials such that any two different polynomials in the sequence are orthogonal to each other under some inner product.

https://en.wikipedia.org/wiki/Orthogonal_polynomials

Orthogonal coordinates

In mathematics, orthogonal coordinates are defined as a set of d coordinates q = (q1, q2, ..., qd) in which the coordinate hypersurfaces all meet at right angles (note: superscripts are indices, not exponents).

https://en.wikipedia.org/wiki/Orthogonal_coordinates

Projective orthogonal group

TWOFOLD QUOTIENT OF THE ORTHOGONAL GROUP: PO(N) = O(N)/{±1}

Projective special orthogonal group; Projective general orthogonal group

In projective geometry and linear algebra, the projective orthogonal group PO is the induced action of the orthogonal group of a quadratic space V = (V,Q)A quadratic space is a vector space V together with a quadratic form Q; the Q is dropped from notation when it is clear. on the associated projective space P(V).

https://en.wikipedia.org/wiki/Projective_orthogonal_group

Wikipedia

Orthogonal coordinates

In mathematics, orthogonal coordinates are defined as a set of d coordinates $\mathbf {q} =(q^{1},q^{2},\dots ,q^{d})$ in which the coordinate hypersurfaces all meet at right angles (note that superscripts are indices, not exponents). A coordinate surface for a particular coordinate q^k is the curve, surface, or hypersurface on which q^k is a constant. For example, the three-dimensional Cartesian coordinates (x, y, z) is an orthogonal coordinate system, since its coordinate surfaces x = constant, y = constant, and z = constant are planes that meet at right angles to one another, i.e., are perpendicular. Orthogonal coordinates are a special but extremely common case of curvilinear coordinates.

https://en.wikipedia.org/wiki/Orthogonal coordinates