Here is a list of all documented functions, variables, defines, enums, and typedefs with links to the documentation:

### - u -

- UndrawChatMessage() : texteff.cpp
- UniqueLanguageFile() : strings.cpp
- UnlinkWagon() : train_cmd.cpp
- UnloadCustomEngineSprites() : newgrf_engine.cpp , newgrf_engine.h
- UnloadWagonOverrides() : newgrf_engine.cpp , newgrf_engine.h
- UNMOVABLE_HQ_EAST : unmovable_map.h
- UNMOVABLE_HQ_END : unmovable_map.h
- UNMOVABLE_HQ_NORTH : unmovable_map.h
- UNMOVABLE_HQ_SOUTH : unmovable_map.h
- UNMOVABLE_HQ_WEST : unmovable_map.h
- UNMOVABLE_LIGHTHOUSE : unmovable_map.h
- UNMOVABLE_OWNED_LAND : unmovable_map.h
- UNMOVABLE_STATUE : unmovable_map.h
- UNMOVABLE_TRANSMITTER : unmovable_map.h
- UnmovableType : unmovable_map.h
- UnpackOldOrder() : order.h , order_cmd.cpp
- UnpackVersion4Order() : order_cmd.cpp
- UpdateAircraftCache() : aircraft.h , aircraft_cmd.cpp
- UpdateAircraftSpeed() : aircraft_cmd.cpp
- UpdateAirplanesOnNewStation() : aircraft.h , aircraft_cmd.cpp
- UpdateAllSignVirtCoords() : signs.cpp , signs.h
- UpdateAllStationVirtCoord() : main_gui.cpp , station.h , station_cmd.cpp
- UpdateAllTownVirtCoords() : town_cmd.cpp , town.h
- UpdateAllWaypointSigns() : waypoint.cpp , waypoint.h
- UpdateCompanyRatingAndValue() : economy.cpp , economy_func.h
- UpdateHousesAndTowns() : newgrf_house.cpp , newgrf_house.h
- UpdateLevelCrossing() : road_func.h , train_cmd.cpp
- UpdateNumEngineGroup() : group_cmd.cpp
- UpdateOldAircraft() : openttd.cpp , aircraft_cmd.cpp
- UpdateOptionWidgetStatus() : road_gui.cpp
- UpdateSignalsAroundSegment() : signal.cpp
- UpdateSignalsInBuffer() : signal.cpp , signal_func.h , signal.cpp
- UpdateSignalsOnSegment() : signal.cpp , signal_func.h
- UpdateSignVirtCoords() : signs.cpp
- UpdateStationAcceptance() : station_cmd.cpp
- UpdateStationVirtCoord() : station_cmd.cpp
- UpdateStationVirtCoordDirty() : station_cmd.cpp
- UpdateTextBufferSize() : misc_gui.cpp , textbuf_gui.h
- UpdateTileSelection() : viewport.cpp , window.cpp
- UpdateTownGrowRate() : town_cmd.cpp
- UpdateTownVirtCoord() : town_cmd.cpp , town.h
- UpdateTrainGroupID() : group.h , group_cmd.cpp
- UpdateTrainPowerProc() : rail_cmd.cpp , rail.h
- UpdateWaypointSign() : waypoint.cpp
- USE_COLORTABLE : sprites.h
- UsesWagonOverride() : newgrf_engine.cpp , newgrf_engine.h
- Utf8CharLen() : string_func.h
- Utf8EncodedCharLen() : string_func.h
- Utf8PrevChar() : string_func.h
- Utf8TrimString() : string.cpp , string_func.h