- o -

• OBJECT_HQ : object_type.h
• OBJECT_LIGHTHOUSE : object_type.h
• OBJECT_OWNED_LAND : object_type.h
• OBJECT_SIZE_1X1 : newgrf_object.h
• OBJECT_STATUE : object_type.h
• OBJECT_TRANSMITTER : object_type.h
• origin_currency_specs : currency.cpp
• ORIGINAL_SAMPLE_COUNT : sound_type.h
• OSK_KEYBOARD_ENTRIES : textbuf_gui.h
• OUTPUT_BLOCK_SIZE : settingsgen.cpp
• OWNED_BY_OWNER_IN_PARAMETERS_OFFSET : company_func.h
• OwnedPPPonPCP : elrail_data.h