Index - O
| Object | Erb |
| objectName | XPrelude |
| objectterm | Erb |
| odd | XPrelude |
| on | XPrelude |
| onblack | XPrelude |
| onblue | XPrelude |
| oncyan | XPrelude |
| OnDecodeError | XPrelude |
| ondullblack | XPrelude |
| ondullblue | XPrelude |
| ondullcyan | XPrelude |
| ondullgreen | XPrelude |
| ondullmagenta | XPrelude |
| ondullred | XPrelude |
| ondullwhite | XPrelude |
| ondullyellow | XPrelude |
| one | XPrelude |
| OnError | XPrelude |
| onException | XPrelude |
| ongreen | XPrelude |
| only | XPrelude |
| onmagenta | XPrelude |
| onred | XPrelude |
| onwhite | XPrelude |
| onyellow | XPrelude |
| openFile | XPrelude |
| operator | Erb |
| Optic | XPrelude |
| Optic' | XPrelude |
| Optical | XPrelude |
| Optical' | XPrelude |
| Option | |
| 1 (Data Constructor) | XPrelude |
| 2 (Type/Class) | XPrelude |
| option | XPrelude |
| optional | XPrelude |
| Or | Puppet.Parser |
| or | XPrelude |
| orAlt | XPrelude |
| Ord | XPrelude |
| ord | XPrelude |
| Ordering | XPrelude |
| ordNub | XPrelude |
| orElse | XPrelude |
| orEmpty | XPrelude |
| orOf | XPrelude |
| OrOperation | Erb |
| OrSearch | Puppet.Parser |
| otherwise | XPrelude |
| outside | XPrelude |
| Over | XPrelude |
| over | XPrelude |
| Over' | XPrelude |
| overA | XPrelude |
| Overflow | XPrelude |
| overflowError | XPrelude |
| OverrideType | Puppet.Interpreter, Puppet.Runner |