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 : LinkGraphJob::NodeAnnotation
- UndeliveredSupply() : LinkGraphJob::Node
- UnfocusFocusedWidget() : Window
- UnFoldAll() : SettingEntry , SettingsPage
- Uninitialize() : Game , AI
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_volume : CargoSpec
- Unload() : VehicleCargoList
- UnloadCount() : VehicleCargoList
- UnmappedChoiceList() : UnmappedChoiceList
- Unpack() : VehicleListIdentifier
- Unpause() : AI , Game , ScriptInstance
- Unqueue() : LinkGraphSchedule
- UnreserveSingleTrack() : CYapfReserveTrack< Types >
- unsatisfied_demand : LinkGraphJob::EdgeAnnotation
- UnsatisfiedDemand() : LinkGraphJob::Edge
- Unselect() : ClientNetworkContentSocketHandler
- UnselectAll() : ClientNetworkContentSocketHandler
- UNSELECTED : ContentInfo
- UnselectVehicle() : VehicleGroupWindow
- UNSET : GRFTempEngineData
- unshaded_size : Window
- unwanted : Town
- Update() : Backup< T > , LinkGraph::Edge , 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
- UpdateSupply() : LinkGraph::Node
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Station , Town , Waypoint
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : BuildIndustryWindow , NetworkChatWindow , PaymentRatesGraphWindow , RefitWindow , GoalQuestionWindow , NewGRFParametersWindow , GenerateProgressWindow , NewsWindow , BuildObjectWindow , OrdersWindow , EnginePreviewWindow , ScenarioEditorToolbarWindow , SetDateWindow , QueryStringWindow , CompanyWindow , GameOptionsWindow , SelectCompanyManagerFaceWindow , VehicleListWindow , CompanyFinancesWindow , StationViewWindow , BuildVehicleWindow , MusicTrackSelectionWindow , ReplaceVehicleWindow , SelectGameWindow , TownAuthorityWindow , TimetableWindow , AISettingsWindow , BuildTreesWindow , TownDirectoryWindow , AboutWindow , IndustryDirectoryWindow , VehicleDetailsWindow , TownViewWindow , AIListWindow , GameSettingsWindow , StatusBarWindow , AIConfigWindow , AIDebugWindow , BuildAirportWindow , SubsidyListWindow , BuildBridgeWindow , CheatWindow , CustomCurrencyWindow , NetworkClientListWindow , Window , NetworkGameWindow , MusicWindow , QueryWindow , TooltipsWindow , LandInfoWindow , IndustryCargoesWindow , IndustryViewWindow , VehicleGroupWindow , SelectStationWindow< T > , BaseGraphWindow , GoalListWindow , CreateScenarioWindow , SelectCompanyLiveryWindow , CompanyInfrastructureWindow , CompanyStationsWindow , BuyCompanyWindow , DepotWindow , ScanProgressWindow , BuildRailStationWindow , SaveLoadWindow , GenerateLandscapeWindow , BuildRailWaypointWindow , CompanyLeagueWindow , PerformanceRatingDetailWindow , MessageHistoryWindow , NetworkStartServerWindow , NewGRFInspectWindow , VehicleViewWindow , SpriteAlignerWindow , NetworkLobbyWindow , NetworkJoinStatusWindow , NetworkClientListPopupWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : ContentInfo , GRFConfig , NetworkHTTPContentConnecter , ScriptInfo
- Usage() : LinkGraph::EdgeWrapper< Tedge >
- usage : LinkProperties , LinkGraph::BaseEdge
- use_as_random : AIInfo
- use_password : NetworkCompanyInfo , NetworkGameInfo
- UseAsRandomAI() : AIInfo
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_32bppAnim , Blitter_Null , Blitter_32bppBase , Blitter , Blitter_8bppBase
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec
- UseTextRefStack() : CommandCost