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

### - u -

- ui_count : NewGRFClass< Tspec, Tid, Tmax >
- UnfocusFocusedWidget() : Window
- UnFoldAll() : SettingsPage , SettingEntry
- Uninitialize() : AI , Game
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_per_em : FontCache
- units_volume : CargoSpec
- UnmappedChoiceList() : UnmappedChoiceList
- Unpack() : VehicleListIdentifier
- Unpause() : Game , ScriptInstance , AI
- 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
- UpdateCaretPosition() : Textbuf
- UpdateDeltaXY() : Aircraft , EffectVehicle , RoadVehicle , Ship , Train , Vehicle , DisasterVehicle
- UpdateFilterState() : SettingEntry , SettingsPage
- UpdateInclination() : GroundVehicle< T, Type >
- UpdateListPos() : NetworkGameWindow
- UpdateMarkedText() : Textbuf
- UpdateNewGRFScanStatus() : ScanProgressWindow
- UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
- UpdateOrderTimetable() : OrderList
- UpdateOskState() : OskWindow
- UpdatePalette() : CocoaSubdriver
- UpdatePosition() : ViewportSign , Scrollbar
- UpdateProfits() : GroupStatistics
- UpdateRealOrderIndex() : Vehicle
- UpdateRefittability() : GRFTempEngineData
- UpdateSelectionStates() : TimetableWindow
- UpdateSize() : Textbuf
- UpdateSpeed() : RoadVehicle , Train
- UpdateStatistics() : BaseGraphWindow
- UpdateStringIter() : Textbuf
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Station , Town , Waypoint
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : QueryStringWindow , AboutWindow , RefitWindow , SelectGameWindow , IndustryCargoesWindow , BuildRailWaypointWindow , GameSettingsWindow , BuildIndustryWindow , GameOptionsWindow , CompanyStationsWindow , SelectStationWindow< T > , PaymentRatesGraphWindow , BaseGraphWindow , MusicWindow , NetworkChatWindow , GenerateProgressWindow , SubsidyListWindow , ScenarioEditorToolbarWindow , AIListWindow , EnginePreviewWindow , DepotWindow , TownViewWindow , AISettingsWindow , CompanyWindow , TownAuthorityWindow , BuildTreesWindow , AIConfigWindow , CompanyFinancesWindow , CheatWindow , VehicleListWindow , AIDebugWindow , BuildAirportWindow , ReplaceVehicleWindow , BuildBridgeWindow , BuildVehicleWindow , TownDirectoryWindow , StatusBarWindow , SelectCompanyLiveryWindow , SelectCompanyManagerFaceWindow , CompanyInfrastructureWindow , BuyCompanyWindow , SetDateWindow , TimetableWindow , CustomCurrencyWindow , SaveLoadWindow , Window , NewGRFParametersWindow , ScanProgressWindow , NetworkJoinStatusWindow , NetworkLobbyWindow , NetworkStartServerWindow , OrdersWindow , MusicTrackSelectionWindow , TooltipsWindow , LandInfoWindow , VehicleDetailsWindow , IndustryDirectoryWindow , VehicleGroupWindow , GenerateLandscapeWindow , CreateScenarioWindow , GoalListWindow , GoalQuestionWindow , StationViewWindow , NewsWindow , BuildSignalWindow , CompanyLeagueWindow , PerformanceRatingDetailWindow , IndustryViewWindow , MessageHistoryWindow , BuildRailStationWindow , QueryWindow , SpriteAlignerWindow , VehicleViewWindow , NetworkGameWindow , NetworkClientListWindow , NetworkClientListPopupWindow , NewGRFInspectWindow , BuildObjectWindow
- UpdateWidth() : Textbuf
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : ScriptInfo , NetworkHTTPContentConnecter , ContentInfo , GRFConfig
- use_as_random : AIInfo
- use_password : NetworkGameInfo , NetworkCompanyInfo
- UseAsRandomAI() : AIInfo
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_Null , Blitter_32bppAnim , Blitter , Blitter_32bppBase , Blitter_8bppBase
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec
- UseTextRefStack() : CommandCost
- utf16_str : IcuStringIterator
- utf16_to_utf8 : IcuStringIterator