| objective | Algorithms.Geometry.LinearProgramming.Types | 
| On | Data.Geometry.Line.Internal, Data.Geometry.Line, Data.Geometry | 
| onBall | Data.Geometry.Ball | 
| OnBoundary | Data.Geometry.Boundary | 
| onBoundary | Data.Geometry.Polygon, Data.Geometry | 
| One | Data.Geometry.Vector.VectorFamilyPeano | 
| oneDLinearProgramming | Algorithms.Geometry.LinearProgramming.LP2DRIC | 
| onHalfLine | Data.Geometry.HalfLine | 
| OnLine | Data.Geometry.Line.Internal, Data.Geometry.Line, Data.Geometry | 
| onLine | Data.Geometry.Line.Internal, Data.Geometry.Line, Data.Geometry | 
| onLine2 | Data.Geometry.Line.Internal, Data.Geometry.Line, Data.Geometry | 
| onSegment | Data.Geometry.LineSegment, Data.Geometry | 
| onSide | Data.Geometry.Line.Internal, Data.Geometry.Line, Data.Geometry | 
| onSideUpDown | Data.Geometry.Line.Internal, Data.Geometry.Line, Data.Geometry | 
| OnSideUpDownTest | Data.Geometry.Line.Internal, Data.Geometry.Line, Data.Geometry | 
| onSubLine | Data.Geometry.SubLine | 
| onSubLine2 | Data.Geometry.SubLine | 
| onSubLine2UB | Data.Geometry.SubLine | 
| onSubLineUB | Data.Geometry.SubLine | 
| onTriangle | Data.Geometry.Triangle | 
| Open | Data.Geometry.Interval, Data.Geometry.LineSegment, Data.Geometry | 
| OpenInterval | Data.Geometry.Interval, Data.Geometry.LineSegment, Data.Geometry | 
| OpenLineSegment | Data.Geometry.LineSegment, Data.Geometry | 
| OpenRange | Data.Geometry.Interval, Data.Geometry.LineSegment, Data.Geometry | 
| oppositeDirection | Data.Geometry.Directions | 
| ordAt | Algorithms.Geometry.LineSegmentIntersection.BentleyOttmann | 
| orderedEndPoints | Data.Geometry.LineSegment, Data.Geometry | 
| ordNub | Data.Geometry.KDTree | 
| ordPoints | Algorithms.Geometry.LineSegmentIntersection.BentleyOttmann | 
| origin | Data.Geometry.Point, Data.Geometry | 
| Original | Algorithms.Geometry.PolygonTriangulation.Types | 
| Orthogonal | Data.Geometry.Slab | 
| outer | Data.Geometry.Vector, Data.Geometry | 
| outerBoundary | Data.Geometry.Polygon, Data.Geometry | 
| outerBoundaryDarts | Data.Geometry.PlanarSubdivision.Basic, Data.Geometry.PlanarSubdivision | 
| outerBoundaryEdge | Data.Geometry.Polygon, Data.Geometry | 
| outerBoundaryEdges | Data.Geometry.Polygon, Data.Geometry | 
| outerFaceDart | Data.PlaneGraph.Core, Data.PlaneGraph | 
| outerFaceId |  | 
| 1 (Function) | Data.PlaneGraph.Core, Data.PlaneGraph | 
| 2 (Function) | Data.Geometry.PlanarSubdivision.Basic, Data.Geometry.PlanarSubdivision | 
| outerVertex | Data.Geometry.Polygon, Data.Geometry | 
| outgoingEdges |  | 
| 1 (Function) | Data.PlaneGraph.Core, Data.PlaneGraph | 
| 2 (Function) | Data.Geometry.PlanarSubdivision.Basic, Data.Geometry.PlanarSubdivision | 
| Outside |  | 
| 1 (Data Constructor) | Data.Geometry.Boundary | 
| 2 (Data Constructor) | Data.Geometry.PlanarSubdivision.Basic, Data.Geometry.PlanarSubdivision |