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

### - u -

- undelivered_supply : Node
- UnfocusFocusedWidget() : Window
- Uninitialize() : Game , AI
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_volume : CargoSpec
- UnmappedChoiceList() : UnmappedChoiceList
- Unpack() : VehicleListIdentifier
- Unreserve() : VehicleCargoList
- UnreserveSingleTrack() : CYapfReserveTrack< Types >
- unsatisfied_demand : Edge
- Unselect() : ClientNetworkContentSocketHandler
- UnselectAll() : ClientNetworkContentSocketHandler
- UNSELECTED : ContentInfo
- UnselectVehicle() : VehicleGroupWindow
- unshaded_size : Window
- unwanted : Town
- Update() : Backup< T > , CargoDataEntry
- update_frequency : ServerNetworkAdminSocketHandler
- UpdateAfterLoad() : GroupStatistics
- UpdateAutoRefitState() : OrdersWindow
- UpdateAutoreplace() : GroupStatistics
- UpdateDeltaXY() : Vehicle , FINAL
- UpdateInclination() : GroundVehicle< T, Type >
- UpdateNewGRFScanStatus() : ScanProgressWindow
- UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
- UpdateOrderTimetable() : OrderList
- UpdateOskState() : OskWindow
- UpdateOverlayCargoes() : LinkGraphLegendWindow
- UpdateOverlayCompanies() : LinkGraphLegendWindow
- UpdatePalette() : CocoaSubdriver
- UpdatePosition() : ViewportSign , Scrollbar
- UpdateProfits() : GroupStatistics
- UpdateRealOrderIndex() : Vehicle
- UpdateSelectionStates() : TimetableWindow
- UpdateStatistics() : BaseGraphWindow
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Town
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : TimetableWindow , Window , SelectCompanyManagerFaceWindow , CompanyInfrastructureWindow , NewGRFInspectWindow , NetworkJoinStatusWindow , NetworkClientListWindow , CompanyWindow , NetworkLobbyWindow , BuyCompanyWindow , SetDateWindow , DepotWindow , TooltipsWindow , AboutWindow , LandInfoWindow , EnginePreviewWindow , IndustryCargoesWindow , CreateScenarioWindow , TownDirectoryWindow , GenerateProgressWindow , VehicleGroupWindow , PerformanceRatingDetailWindow , CompanyLeagueWindow , GoalListWindow , GoalQuestionWindow , BaseGraphWindow , TownAuthorityWindow , PaymentRatesGraphWindow , TownViewWindow , GameDifficultyWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , StatusBarWindow , SelectGameWindow , SubsidyListWindow , SelectCompanyLiveryWindow , CompanyFinancesWindow , CheatWindow , BuildTreesWindow , BuildBridgeWindow , ScenarioEditorToolbarWindow , BuildAirportWindow , SelectStationWindow< T > , AISettingsWindow , GameSettingsWindow , GameOptionsWindow , StationViewWindow , BuildObjectWindow , MessageHistoryWindow , NewsWindow , QueryWindow , CompanyStationsWindow , MusicTrackSelectionWindow , MusicWindow , CustomCurrencyWindow , NetworkClientListPopupWindow , MessageOptionsWindow , SpriteAlignerWindow , NewGRFParametersWindow , ScanProgressWindow , BuildRailWaypointWindow , OrdersWindow , BuildRailStationWindow , AIListWindow , RefitWindow , VehicleViewWindow , AIConfigWindow , VehicleDetailsWindow , ReplaceVehicleWindow , VehicleListWindow , BuildVehicleWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : NetworkHTTPContentConnecter , ScriptInfo , ContentInfo , GRFConfig
- 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_32bppBase , Blitter_8bppBase , Blitter_Null , Blitter
- user : OrderBackup
- user_def_data : RailVehicleInfo , TrainCache
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec
- UseTextRefStack() : CommandCost