### - i -

- ICON_CMDLN_SIZE : console_internal.h
- ICON_MAX_ALIAS_LINES : console.cpp
- ICON_MAX_STREAMSIZE : console_internal.h
- ICON_TOKEN_COUNT : console.cpp
- iFBlitter_32bppAnim : 32bpp_anim.cpp
- iFBlitter_32bppOptimized : 32bpp_optimized.cpp
- iFBlitter_32bppSimple : 32bpp_simple.cpp
- iFBlitter_8bppOptimized : 8bpp_optimized.cpp
- iFBlitter_8bppSimple : 8bpp_simple.cpp
- iFBlitter_Null : null.cpp
- iFMusicDriver_BeMidi : bemidi.cpp
- iFMusicDriver_ExtMidi : extmidi.cpp
- iFMusicDriver_LibTimidity : libtimidity.cpp
- iFMusicDriver_Null : null_m.cpp
- iFMusicDriver_OS2 : os2_m.cpp
- iFSoundDriver_Null : null_s.cpp
- iFSoundDriver_SDL : sdl_s.cpp
- iFVideoDriver_Null : null_v.cpp
- IgnoredPCP : elrail_data.h
- INDUSTRY_COMPLETED : industry_type.h
- INDUSTRY_CUT_TREE_TICKS : date_type.h
- INDUSTRY_PRODUCE_TICKS : date_type.h
- INDUSTRYTILE_NOANIM : industry_type.h
- INITIAL_DISASTER_VEHICLE_ZPOS : disaster_cmd.cpp
- INVALID_ADMIN_ID : network_type.h
- INVALID_AIRPORTTILE : airport.h
- INVALID_CARGO : cargotype.h
- INVALID_COORD : vehicle_base.h
- INVALID_DATE : date_type.h
- INVALID_ENGINE : engine_type.h
- INVALID_GOALTYPE : goal_type.h
- INVALID_GROUP : group_type.h
- INVALID_INDUSTRYTILE : industry_type.h
- INVALID_INDUSTRYTYPE : industry_type.h
- INVALID_OBJECT : object_type.h
- INVALID_OBJECT_TYPE : object_type.h
- INVALID_ORDER : order_type.h
- INVALID_SIGN : signs_type.h
- INVALID_SOURCE : cargo_type.h
- INVALID_STRING_ID : strings_type.h
- INVALID_TICKS : date_type.h
- INVALID_TILE : tile_type.h
- INVALID_VEH_ORDER_ID : order_type.h
- INVALID_VEHICLE : vehicle_type.h
- INVALID_YEAR : date_type.h
- IT_AI_TOWN : newgrf_generic.h
- IT_AI_UNKNOWN : newgrf_generic.h