### - u -

- ui_count : NewGRFClass< Tspec, Tid, Tmax >
- unique_id : ContentInfo
- unitnumber : Vehicle
- unitnumber_digits : BaseVehicleListWindow
- units : LocaleSettings
- units_volume : CargoSpec
- unshaded_size : Window
- unwanted : Town
- update_frequency : ServerNetworkAdminSocketHandler
- upgrade : ContentInfo
- url : ContentInfo , NetworkHTTPContentConnecter , GRFConfig , ScriptInfo
- use_as_random : AIInfo
- use_password : NetworkGameInfo , NetworkCompanyInfo
- used_liveries : GRFLoadedFeatures
- used_set : BaseMedia< Tbase_set >
- user : OrderBackup
- user_def_data : TrainCache , RailVehicleInfo