[ObsoleteAttribute("This property is obsolete in Revit 2016.  Use the FaceNormal property or Face.ComputeNormal() instead.")]
public XYZ Normal { get; }

<ObsoleteAttribute("This property is obsolete in Revit 2016.  Use the FaceNormal property or Face.ComputeNormal() instead.")> _
Public ReadOnly Property Normal As XYZ
	Get

[ObsoleteAttribute(L"This property is obsolete in Revit 2016.  Use the FaceNormal property or Face.ComputeNormal() instead.")]
public:
property XYZ^ Normal {
	XYZ^ get ();
}

This property is the "surface normal" vector. This is not necessarily the normal vector pointing out of the solid that contains the face, to get that value use ComputeNormal(UV) or FaceNormal