| 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 |
| onHalfLine | Data.Geometry.HalfLine |
| 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 |
| onSubLine | Data.Geometry.SubLine |
| onSubLine2 | Data.Geometry.SubLine |
| Opacity | Data.Geometry.Ipe.Attributes, Data.Geometry.Ipe |
| OpacitySym0 | Data.Geometry.Ipe.Attributes, Data.Geometry.Ipe |
| Open | Data.Range, Data.Geometry.Interval, Data.Geometry.LineSegment, Data.Geometry |
| OpenInterval | Data.Geometry.Interval, Data.Geometry.LineSegment, Data.Geometry |
| OpenRange | Data.Range, Data.Geometry.Interval, Data.Geometry.LineSegment, Data.Geometry |
| Operation | Data.Geometry.Ipe.Types, Data.Geometry.Ipe |
| Orbit | Data.Permutation |
| orbitFrom | Data.Permutation |
| orbits | Data.Permutation |
| ordAt | Algorithms.Geometry.LineSegmentIntersection.BentleyOttmann |
| orderedEndPoints | Data.Geometry.LineSegment, Data.Geometry |
| ordNav | Data.BalBST |
| ordNavBy | Data.BalBST |
| ordNub | Data.Geometry.KDTree |
| ordPoints | Algorithms.Geometry.LineSegmentIntersection.BentleyOttmann |
| OrdSeq | |
| 1 (Type/Class) | Data.OrdSeq |
| 2 (Data Constructor) | Data.OrdSeq |
| 3 (Type/Class) | Data.SlowSeq |
| 4 (Data Constructor) | Data.SlowSeq |
| 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 |
| outerFaceId | |
| 1 (Function) | Data.PlaneGraph |
| 2 (Function) | Data.Geometry.PlanarSubdivision.Basic, Data.Geometry.PlanarSubdivision |
| outerVertex | Data.Geometry.Polygon, Data.Geometry |
| outgoingEdges | |
| 1 (Function) | Data.PlanarGraph |
| 2 (Function) | Data.PlaneGraph |
| 3 (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 |