Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

### - u -

- UnfocusFocusedWidget() : Window
- Uninitialize() : AI , Game
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_volume : CargoSpec
- UnmappedChoiceList() : UnmappedChoiceList
- Unpack() : VehicleListIdentifier
- UnreserveSingleTrack() : CYapfReserveTrack< Types >
- Unselect() : ClientNetworkContentSocketHandler
- UnselectAll() : ClientNetworkContentSocketHandler
- UNSELECTED : ContentInfo
- UnselectVehicle() : VehicleGroupWindow
- unshaded_size : Window
- unwanted : Town
- Update() : Backup< T >
- update_frequency : ServerNetworkAdminSocketHandler
- UpdateAfterLoad() : GroupStatistics
- UpdateAutoRefitState() : OrdersWindow
- UpdateAutoreplace() : GroupStatistics
- UpdateDeltaXY() : FINAL , Vehicle , FINAL
- UpdateInclination() : GroundVehicle< T, Type >
- UpdateNewGRFScanStatus() : ScanProgressWindow
- UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
- UpdateOrderTimetable() : OrderList
- UpdateOskState() : OskWindow
- UpdatePalette() : CocoaSubdriver
- UpdatePosition() : ViewportSign , Scrollbar
- UpdateProfits() : GroupStatistics
- UpdateRealOrderIndex() : Vehicle
- UpdateSelectionStates() : TimetableWindow
- UpdateStatistics() : BaseGraphWindow
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Town
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : SelectStationWindow< T > , MessageOptionsWindow , MessageHistoryWindow , TownAuthorityWindow , EnginePreviewWindow , NewGRFParametersWindow , CreateScenarioWindow , NewGRFInspectWindow , GenerateProgressWindow , NetworkClientListWindow , NetworkClientListPopupWindow , GoalListWindow , GoalQuestionWindow , MusicTrackSelectionWindow , BaseGraphWindow , PaymentRatesGraphWindow , CompanyLeagueWindow , LandInfoWindow , SelectGameWindow , StatusBarWindow , ScenarioEditorToolbarWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , IndustryCargoesWindow , TimetableWindow , BuildRailStationWindow , CustomCurrencyWindow , AboutWindow , TooltipsWindow , QueryWindow , DepotWindow , MusicWindow , BuyCompanyWindow , NetworkLobbyWindow , CompanyInfrastructureWindow , VehicleListWindow , SelectCompanyLiveryWindow , TownViewWindow , CheatWindow , SubsidyListWindow , BuildBridgeWindow , CompanyStationsWindow , BuildAirportWindow , GameOptionsWindow , AISettingsWindow , OrdersWindow , GameDifficultyWindow , NewsWindow , SpriteAlignerWindow , StationViewWindow , BuildRailWaypointWindow , GameSettingsWindow , NetworkJoinStatusWindow , ScanProgressWindow , TownDirectoryWindow , VehicleViewWindow , AIListWindow , BuildObjectWindow , AIConfigWindow , Window , ReplaceVehicleWindow , BuildVehicleWindow , SetDateWindow , CompanyWindow , SelectCompanyManagerFaceWindow , BuildTreesWindow , VehicleDetailsWindow , CompanyFinancesWindow , RefitWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : NetworkHTTPContentConnecter , ScriptInfo , GRFConfig , ContentInfo
- use_as_random : AIInfo
- use_password : NetworkCompanyInfo , NetworkGameInfo
- UseAsRandomAI() : AIInfo
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_Null , Blitter_32bppBase , Blitter , Blitter_8bppBase
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec
- UseTextRefStack() : CommandCost