A reference point in an Autodesk Revit family. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
Remarks
 A ReferencePoint represents a point in space together with a local coordinate system. ReferencePoints can be free, or constrained to other elements in several ways. When the point is constrained, the coordinate system is also constrained in certain ways.