This .NET class wraps the AcGePointEnt2d ObjectARX class. It's an abstract base class for 2D point classes.

Autodesk.AutoCAD.Geometry.Entity2d
    Autodesk.AutoCAD.Geometry.PointEntity2d
        Autodesk.AutoCAD.Geometry.PointOnCurve2d
        Autodesk.AutoCAD.Geometry.Position2d

Public abstract Class PointEntity2d
Inherits Entity2d

public abstract class PointEntity2d : Entity2d;