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Short for control vertex.

In NURBS modeling, a vertex that controls a CV Curve or CV Surface. The 3D location of each CV affects the shape of the curve or surface. CVs aren't constrained to lie on the curve or surface. Each CV has a rational weight that can be used to adjust the influence of the CV on the curve's or surface's shape.

CVs (control vertices) in the lattice surrounding a NURBS surface