Index - O
| oblique | Diagrams.TwoD.Text, Diagrams.TwoD, Diagrams.Prelude |
| octagon | Diagrams.TwoD.Shapes, Diagrams.TwoD, Diagrams.Prelude |
| oldlace | Diagrams.Prelude |
| olive | Diagrams.Prelude |
| olivedrab | Diagrams.Prelude |
| Opacity | Diagrams.Attributes, Diagrams.Prelude |
| opacity | Diagrams.Attributes, Diagrams.Prelude |
| open | Diagrams.Path, Diagrams.Prelude |
| Options | Diagrams.Prelude, Diagrams.Backend.Show |
| orange | Diagrams.Prelude |
| orangered | Diagrams.Prelude |
| orbits | Diagrams.TwoD.Polygons |
| orchid | Diagrams.Prelude |
| OrderedField | Diagrams.Prelude |
| orient | Diagrams.TwoD.Polygons |
| OrientH | Diagrams.TwoD.Polygons, Diagrams.TwoD, Diagrams.Prelude |
| OrientTo | Diagrams.TwoD.Polygons, Diagrams.TwoD, Diagrams.Prelude |
| OrientV | Diagrams.TwoD.Polygons, Diagrams.TwoD, Diagrams.Prelude |
| origin | Diagrams.Prelude |
| outside | Diagrams.BoundingBox, Diagrams.Prelude |
| outside' | Diagrams.BoundingBox, Diagrams.Prelude |