- o -

• o_dir : SaveLoadWindow
• obj : ObjectScopeResolver
• obj_len : SaveLoadParams
• object_classes : BuildObjectWindow
• OBJECT_MARGIN : BuildObjectWindow
• object_scope : ObjectResolverObject
• occupied : RoadStop::Entry
• ocean_speed_frac : ShipVehicleInfo
• offs : TileHighlightData
• offs_start_map : SpriteAlignerWindow
• offset : Blitter_32bppOptimized::SpriteData , Blitter_8bppOptimized::SpriteData , BmpInfo , CompanyManagerFaceBitsInfo , LoggedChange , OldChunks , StringParameters , UnmappedChoiceList
• offset_proc : NICallback , NIProperty
• offsets : LanguagePackHeader
• oil_refinery : ExtraPaletteValues
• oil_refinery_limit : GameCreationSettings
• ok_button : QueryString
• okay : PBSTileInfo
• old : Vehicle
• old_act : TransportedCargoStat< Tstorage >
• old_coord : MutableSpriteCache
• old_economy : CompanyProperties
• old_font : Win32FontCache
• old_max : TransportedCargoStat< Tstorage >
• old_max_loan_unround : Economy
• old_max_loan_unround_fract : Economy
• old_refittable : ShipVehicleInfo
• old_tile : GetNewVehiclePosResult
• oldval : LoggedChange
• open : NewsSettings
• openlist_hash : AyStar
• openlist_queue : AyStar
• openttd_id : LanguageMap::Mapping
• opt : GetOptData
• options : GetOptData
• order : GameSettings , Listing , ParentSpriteToDraw , RefitWindow
• order_arrow_width : BaseVehicleListWindow
• order_over : OrdersWindow
• order_review_system : GUISettings
• orders : OrderBackup , Vehicle
• ordinal_width : CompanyLeagueWindow
• orientation : RailStationGUISettings
• orig_list : NewGRFWindow
• orig_res : VideoDriver_Cocoa
• orig_str_buf : OskWindow
• origin : Path
• original_image_index : Engine
• original_md5sum : GRFConfig
• os2_bmp : BmpInfo
• os_handle : FreeTypeSubSetting
• osk_activation : GUISettings
• other_accepted : CargoesField
• other_company_name : CompanyNewsInformation
• other_produced : CargoesField
• outersize : TileHighlightData
• outgoing_queue : ServerNetworkGameSocketHandler
• output_buffer : OutputStore
• overdrawn_ops : Squirrel
• override : GRFFileProps
• override_end : MusicSongInfo
• override_start : MusicSongInfo
• overtaking : RoadVehicle
• overtaking_ctr : RoadVehicle
• own_name : LanguagePackHeader
• owner : BaseStation , CargoPayment , Group , Industry , TileDesc , Vehicle , Window
• owner_type : TileDesc