Index - O
| OBSCENE_PICTOGRAM | Content.ItemKindEmbed |
| OFF_WORLD_REPRESENTATIVE | Content.FactionKind |
| OILY_FLOOR_DARK | Content.TileKind |
| OILY_FLOOR_LIT | Content.TileKind |
| OIL_PUDDLE | Content.ItemKindEmbed |
| OIL_RESIDUE_DARK | Content.TileKind |
| OIL_RESIDUE_LIT | Content.TileKind |
| OIL_SOURCE | Content.ItemKindBlast |
| OPENABLE_WALL | Content.TileKind |
| OPEN_LIFT | Content.PlaceKind |
| OPEN_STAIRCASE | Content.PlaceKind |
| ORDINARY_LIFT_DOWN | Content.TileKind |
| ORDINARY_LIFT_UP | Content.TileKind |
| ORDINARY_STAIRCASE_DOWN | Content.TileKind |
| ORDINARY_STAIRCASE_UP | Content.TileKind |
| organs | Content.ItemKindOrgan |
| organsGN | Content.ItemKindOrgan |
| organsGNSingleton | Content.ItemKindOrgan |
| ORIELS_FENCE | Content.TileKind |
| otherItemContent | Content.ItemKind |
| OUTDOOR_CLOSED_STAIRCASE | Content.PlaceKind |
| OUTDOOR_ESCAPE_DOWN | Content.PlaceKind |
| OUTDOOR_TINY_STAIRCASE | Content.PlaceKind |
| OUTDOOR_WALLED_STAIRCASE | Content.PlaceKind |