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

### - u -

- UnfocusFocusedWidget() : Window
- Uninitialize() : AI
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_volume : CargoSpec
- UnmappedChoiceList() : UnmappedChoiceList
- Unpack() : VehicleListIdentifier
- UnreserveSingleTrack() : CYapfReserveTrack< Types >
- Unselect() : ClientNetworkContentSocketHandler
- UnselectAll() : ClientNetworkContentSocketHandler
- UNSELECTED : ContentInfo
- UnselectVehicle() : VehicleGroupWindow
- unshaded_size : Window
- UnshareOrders() : AIOrder
- unwanted : Town
- Update() : Backup< T >
- update_frequency : ServerNetworkAdminSocketHandler
- UpdateDeltaXY() : Aircraft , EffectVehicle , RoadVehicle , Ship , Train , Vehicle , DisasterVehicle
- UpdateInclination() : GroundVehicle< T, Type >
- UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
- UpdateOrderTimetable() : OrderList
- UpdateOskState() : OskWindow
- UpdatePosition() : Scrollbar , ViewportSign
- UpdateRealOrderIndex() : Vehicle
- UpdateSelectionStates() : TimetableWindow
- UpdateSpeed() : RoadVehicle , Train
- UpdateStatistics() : BaseGraphWindow
- UpdateViewport() : SpecializedVehicle< T, Type >
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Sign , Station , Town , Waypoint
- UpdateVisualEffect() : Vehicle
- UpdateWidgetSize() : BuildRailStationWindow , OrdersWindow , BuildRailWaypointWindow , MessageOptionsWindow , MessageHistoryWindow , StationViewWindow , ScenarioEditorToolbarWindow , NewGRFParametersWindow , SpriteAlignerWindow , NewGRFInspectWindow , GenerateLandscapeWindow , NetworkClientListWindow , CreateScenarioWindow , NetworkLobbyWindow , GenerateProgressWindow , NetworkGameWindow , NetworkContentListWindow , NetworkChatWindow , BaseGraphWindow , MusicTrackSelectionWindow , TownViewWindow , PaymentRatesGraphWindow , CompanyLeagueWindow , ErrmsgWindow , AboutWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , IndustryCargoesWindow , SelectStationWindow< T > , TimetableWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , SelectGameWindow , LandInfoWindow , SubsidyListWindow , CustomCurrencyWindow , TooltipsWindow , QueryStringWindow , SaveLoadWindow , QueryWindow , DepotWindow , RefitWindow , BuyCompanyWindow , TownAuthorityWindow , SelectCompanyManagerFaceWindow , StatusBarWindow , CompanyFinancesWindow , CheatWindow , BuildVehicleWindow , GameOptionsWindow , ReplaceVehicleWindow , BuildObjectWindow , AIDebugWindow , SignListWindow , AISettingsWindow , NetworkJoinStatusWindow , NetworkClientListPopupWindow , NetworkStartServerWindow , MusicWindow , CompanyStationsWindow , GameDifficultyWindow , GameSettingsWindow , AIListWindow , VehicleDetailsWindow , AIConfigWindow , NewGRFWindow , NewsWindow , BuildAirportWindow , VehicleViewWindow , BuildBridgeWindow , EnginePreviewWindow , SetDateWindow , CompanyWindow , SelectCompanyLiveryWindow , Window , TownDirectoryWindow , VehicleListWindow , BuildTreesWindow
- UpdateZPosition() : GroundVehicle< T, Type >
- UpdateZPositionAndInclination() : GroundVehicle< T, Type >
- upgrade : ContentInfo
- url : ContentInfo , NetworkHTTPContentConnecter
- use_as_random : AIInfo
- use_password : NetworkGameInfo , NetworkCompanyInfo
- UseAsRandomAI() : AIInfo
- used : AILog::LogData
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter_8bppBase , Blitter , Blitter_Null , Blitter_32bppAnim , Blitter_32bppBase
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo
- UserIsAllowedToChangeNewGRFs() : GUISettings
- UsesSmoothEconomy() : IndustrySpec