Index - O
| observe | Circuit.Hyper, Circuit |
| observeK | Circuit.Hyper, Circuit |
| omap | Circuit.Poles |
| Op | Circuit.Syntax |
| open | Circuit.Poles, Circuit |
| Optic | |
| 1 (Type/Class) | Circuit.Optic |
| 2 (Data Constructor) | Circuit.Optic |
| opticAsLens | Circuit.Optic |
| opticBackward | Circuit.Optic |
| opticForward | Circuit.Optic |
| opticPoles | Circuit.Optic |
| opticUpdate | Circuit.Optic |
| Out | |
| 1 (Type/Class) | Circuit.Poles, Circuit |
| 2 (Data Constructor) | Circuit.Poles, Circuit |