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
- 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
- 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() : Town , Waypoint , BaseStation , Sign , Station
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : AboutWindow , LandInfoWindow , TooltipsWindow , IndustryCargoesWindow , MusicWindow , CompanyStationsWindow , StationViewWindow , VehicleGroupWindow , PerformanceRatingDetailWindow , CompanyLeagueWindow , SelectStationWindow< T > , BaseGraphWindow , StatusBarWindow , GoalListWindow , SubsidyListWindow , CreateScenarioWindow , AIListWindow , TownDirectoryWindow , AISettingsWindow , DepotWindow , TownViewWindow , AIConfigWindow , AIDebugWindow , CompanyInfrastructureWindow , SelectCompanyManagerFaceWindow , SelectCompanyLiveryWindow , VehicleListWindow , CheatWindow , BuildAirportWindow , TownAuthorityWindow , ReplaceVehicleWindow , BuildBridgeWindow , BuildVehicleWindow , TimetableWindow , CompanyFinancesWindow , ScenarioEditorToolbarWindow , BuildRailStationWindow , CompanyWindow , BuyCompanyWindow , NetworkStartServerWindow , VehicleDetailsWindow , OrdersWindow , SetDateWindow , NetworkJoinStatusWindow , SpriteAlignerWindow , EnginePreviewWindow , SaveLoadWindow , ScanProgressWindow , NetworkChatWindow , MusicTrackSelectionWindow , QueryWindow , BuildTreesWindow , SelectGameWindow , IndustryDirectoryWindow , GenerateLandscapeWindow , GameSettingsWindow , PaymentRatesGraphWindow , BuildRailWaypointWindow , CustomCurrencyWindow , GenerateProgressWindow , GoalQuestionWindow , GameOptionsWindow , NewGRFInspectWindow , Window , BuildIndustryWindow , IndustryViewWindow , BuildObjectWindow , NewsWindow , QueryStringWindow , NewGRFParametersWindow , RefitWindow , NetworkGameWindow , MessageHistoryWindow , NetworkClientListPopupWindow , VehicleViewWindow , NetworkClientListWindow , NetworkLobbyWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : GRFConfig , ScriptInfo , NetworkHTTPContentConnecter , ContentInfo
- use_as_random : AIInfo
- use_password : NetworkCompanyInfo , NetworkGameInfo
- UseAsRandomAI() : AIInfo
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_32bppBase , Blitter_32bppAnim , Blitter , Blitter_8bppBase , Blitter_Null
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec
- UseTextRefStack() : CommandCost