noun
oblique coordinates
A coordinate system where the axes are not perpendicular. Used in mathematics, especially in geometry and linear algebra.
斜交座標系では、基底ベクトルが直交しない。
In an oblique coordinate system, the basis vectors are not orthogonal.
直交座標 (orthogonal coordinates) has perpendicular axes, while 斜交座標 has non-perpendicular axes.
Compound of 斜 (oblique), 交 (intersect), and 座標 (coordinates). A straightforward technical term.