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- AIR_AIRCRAFT : aircraft.h
- AIR_CTOL : engine.h
- AIR_HELICOPTER : aircraft.h
- AIR_ROTOR : aircraft.h
- AIR_SHADOW : aircraft.h
- ANIMCURSOR_BUILDSIGNALS : sprites.h
- ANIMCURSOR_DEMOLISH : sprites.h
- ANIMCURSOR_LOWERLAND : sprites.h
- ANIMCURSOR_PICKSTATION : sprites.h
- ANIMCURSOR_RAISELAND : sprites.h
- AUTOSAVE_DIR : fileio.h
- AXIS_END : direction_type.h
- AXIS_X : direction_type.h
- AXIS_Y : direction_type.h