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