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
- UNSET : GRFTempEngineData
- unshaded_size : Window
- unwanted : Town
- Update() : Backup< T >
- update_frequency : ServerNetworkAdminSocketHandler
- UpdateAcceleration() : Train
- UpdateAfterLoad() : GroupStatistics
- UpdateAutoRefitState() : OrdersWindow
- UpdateAutoreplace() : GroupStatistics
- UpdateCache() : Ship
- UpdateDeltaXY() : DisasterVehicle , Aircraft , EffectVehicle , RoadVehicle , Ship , Train , Vehicle
- UpdateInclination() : GroundVehicle< T, Type >
- UpdateNewGRFScanStatus() : ScanProgressWindow
- UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
- UpdateOrderTimetable() : OrderList
- UpdateOskState() : OskWindow
- UpdatePalette() : CocoaSubdriver
- UpdatePosition() : ViewportSign , Scrollbar
- UpdateProfits() : GroupStatistics
- UpdateRealOrderIndex() : Vehicle
- UpdateRefittability() : GRFTempEngineData
- UpdateSelectionStates() : TimetableWindow
- UpdateSpeed() : RoadVehicle , Train
- UpdateStatistics() : BaseGraphWindow
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Station , Town , Waypoint
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : StatusBarWindow , CompanyFinancesWindow , NetworkClientListWindow , NetworkClientListPopupWindow , NetworkLobbyWindow , SelectCompanyLiveryWindow , MusicTrackSelectionWindow , SelectCompanyManagerFaceWindow , CompanyInfrastructureWindow , Window , LandInfoWindow , SelectGameWindow , IndustryCargoesWindow , CompanyWindow , IndustryViewWindow , BuyCompanyWindow , SetDateWindow , DepotWindow , CompanyLeagueWindow , PaymentRatesGraphWindow , BaseGraphWindow , TownAuthorityWindow , EnginePreviewWindow , CreateScenarioWindow , GenerateProgressWindow , GoalListWindow , TimetableWindow , GoalQuestionWindow , ScenarioEditorToolbarWindow , BuildRailWaypointWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , BuildIndustryWindow , StationViewWindow , CheatWindow , BuildVehicleWindow , BuildBridgeWindow , TownViewWindow , BuildAirportWindow , SubsidyListWindow , AISettingsWindow , CompanyStationsWindow , MessageHistoryWindow , GameOptionsWindow , BuildRailStationWindow , IndustryDirectoryWindow , TownDirectoryWindow , ScanProgressWindow , SpriteAlignerWindow , SelectStationWindow< T > , GameSettingsWindow , MusicWindow , CustomCurrencyWindow , AboutWindow , TooltipsWindow , QueryWindow , GameDifficultyWindow , NewGRFParametersWindow , VehicleViewWindow , NetworkJoinStatusWindow , NewGRFInspectWindow , OrdersWindow , MessageOptionsWindow , BuildObjectWindow , NewsWindow , BuildTreesWindow , VehicleListWindow , ReplaceVehicleWindow , VehicleDetailsWindow , AIListWindow , AIConfigWindow , RefitWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : ScriptInfo , GRFConfig , ContentInfo , NetworkHTTPContentConnecter
- use_as_random : AIInfo
- use_password : NetworkCompanyInfo , NetworkGameInfo
- UseAsRandomAI() : AIInfo
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_32bppBase , Blitter_32bppAnim , Blitter_8bppBase , Blitter , Blitter_Null
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec
- UseTextRefStack() : CommandCost