### - a -

- AI_DIR : fileio_type.h
- AI_LIBRARY_DIR : fileio_type.h
- AICE_AIRCRAFT_CHECK_ENGINE : newgrf_generic.h
- AICE_ROAD_CHECK_ENGINE : newgrf_generic.h
- AICE_ROAD_GET_FIRST_ENGINE : newgrf_generic.h
- AICE_ROAD_GET_NUMBER_ENGINES : newgrf_generic.h
- AICE_SHIP_CHECK_ENGINE : newgrf_generic.h
- AICE_SHIP_GET_FIRST_ENGINE : newgrf_generic.h
- AICE_SHIP_GET_NUMBER_ENGINES : newgrf_generic.h
- AICE_STATION_GET_STATION_ID : newgrf_generic.h
- AICE_TRAIN_CHECK_RAIL_ENGINE : newgrf_generic.h
- AICONFIG_BOOLEAN : ai_info.hpp
- AICONFIG_RANDOM : ai_info.hpp
- AIR_AIRCRAFT : aircraft.h
- AIR_CTOL : engine_type.h
- AIR_HELICOPTER : aircraft.h
- AIR_ROTOR : aircraft.h
- AIR_SHADOW : aircraft.h
- AISAVE_MAX_DEPTH : ai_instance.cpp
- ANIMCURSOR_BUILDSIGNALS : sprites.h
- ANIMCURSOR_DEMOLISH : sprites.h
- ANIMCURSOR_LOWERLAND : sprites.h
- ANIMCURSOR_PICKSTATION : sprites.h
- ANIMCURSOR_RAISELAND : sprites.h
- AUTOSAVE_DIR : fileio_type.h
- AXIS_END : direction_type.h
- AXIS_X : direction_type.h
- AXIS_Y : direction_type.h