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 >
- undelivered_supply : Node
- UnfocusFocusedWidget() : Window
- UnFoldAll() : SettingEntry , SettingsPage
- Uninitialize() : AI , Game
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_volume : CargoSpec
- UnmappedChoiceList() : UnmappedChoiceList
- Unpack() : VehicleListIdentifier
- Unpause() : Game , ScriptInstance , AI
- Unreserve() : VehicleCargoList
- UnreserveSingleTrack() : CYapfReserveTrack< Types >
- unsatisfied_demand : Edge
- Unselect() : ClientNetworkContentSocketHandler
- UnselectAll() : ClientNetworkContentSocketHandler
- UNSELECTED : ContentInfo
- UnselectVehicle() : VehicleGroupWindow
- UNSET : GRFTempEngineData
- unshaded_size : Window
- unwanted : Town
- Update() : Backup< T > , CargoDataEntry
- update_frequency : ServerNetworkAdminSocketHandler
- UpdateAcceleration() : Train
- UpdateAfterLoad() : GroupStatistics
- UpdateAutoRefitState() : OrdersWindow
- UpdateAutoreplace() : GroupStatistics
- UpdateCache() : Ship
- UpdateDeltaXY() : Aircraft , EffectVehicle , RoadVehicle , Ship , Train , Vehicle , DisasterVehicle
- UpdateFilterState() : SettingEntry , SettingsPage
- UpdateInclination() : GroundVehicle< T, Type >
- UpdateListPos() : NetworkGameWindow
- UpdateNewGRFScanStatus() : ScanProgressWindow
- UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
- UpdateOrderTimetable() : OrderList
- UpdateOskState() : OskWindow
- UpdateOverlayCargoes() : LinkGraphLegendWindow
- UpdateOverlayCompanies() : LinkGraphLegendWindow
- UpdatePalette() : CocoaSubdriver
- UpdatePosition() : ViewportSign , Scrollbar
- UpdateProfits() : GroupStatistics
- UpdateRealOrderIndex() : Vehicle
- UpdateRefittability() : GRFTempEngineData
- UpdateSelectionStates() : TimetableWindow
- UpdateSize() : Textbuf
- UpdateSpeed() : RoadVehicle , Train
- UpdateStatistics() : BaseGraphWindow
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Station , Town , Waypoint
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : AboutWindow , QueryStringWindow , SelectGameWindow , NetworkStartServerWindow , IndustryDirectoryWindow , RefitWindow , BuildIndustryWindow , OrdersWindow , BuildRailWaypointWindow , GameDifficultyWindow , ScenarioEditorToolbarWindow , MusicTrackSelectionWindow , GoalQuestionWindow , StationViewWindow , GenerateProgressWindow , VehicleListWindow , GenerateLandscapeWindow , TimetableWindow , EnginePreviewWindow , NetworkChatWindow , SetDateWindow , TownAuthorityWindow , CompanyWindow , BuildTreesWindow , SelectCompanyManagerFaceWindow , AIListWindow , TownDirectoryWindow , AISettingsWindow , BuildVehicleWindow , AIConfigWindow , VehicleDetailsWindow , AIDebugWindow , TownViewWindow , BuildAirportWindow , ReplaceVehicleWindow , BuildBridgeWindow , GameSettingsWindow , StatusBarWindow , CheatWindow , CompanyFinancesWindow , SelectCompanyLiveryWindow , SubsidyListWindow , CompanyInfrastructureWindow , BuyCompanyWindow , CustomCurrencyWindow , NewsWindow , Window , SelectStationWindow< T > , NetworkClientListWindow , NetworkLobbyWindow , NetworkGameWindow , MusicWindow , QueryWindow , TooltipsWindow , LandInfoWindow , IndustryCargoesWindow , IndustryViewWindow , VehicleGroupWindow , PerformanceRatingDetailWindow , DepotWindow , SaveLoadWindow , CompanyStationsWindow , CreateScenarioWindow , GoalListWindow , MessageHistoryWindow , BaseGraphWindow , PaymentRatesGraphWindow , CompanyLeagueWindow , GameOptionsWindow , MessageOptionsWindow , BuildRailStationWindow , BuildObjectWindow , NetworkClientListPopupWindow , NewGRFParametersWindow , VehicleViewWindow , ScanProgressWindow , SpriteAlignerWindow , NewGRFInspectWindow , NetworkJoinStatusWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : ContentInfo , NetworkHTTPContentConnecter , GRFConfig , ScriptInfo
- usage : LinkProperties
- Usage() : LinkStat
- usage : LinkStat
- use_as_random : AIInfo
- use_password : NetworkGameInfo , NetworkCompanyInfo
- UseAsRandomAI() : AIInfo
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_8bppBase , Blitter_Null , Blitter_32bppAnim , Blitter , Blitter_32bppBase
- user : OrderBackup
- user_def_data : RailVehicleInfo , TrainCache
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec
- UseTextRefStack() : CommandCost