Glossary > 

A point in three-space, created when you use NURBS modeling to create a Point Curve or Point Surface, or when you create an individual point sub-object. Points that are part of a Point Curve or Point Surface are constrained to lie on the curve or surface.

Points behave somewhat like vertices for spline objects, but their behavior is not identical and they are a distinct object type. Helper object points are also a distinct object type. You can't use spline vertices or helper points as NURBS points (though you can convert a spline to a NURBS curve).