A street or road name is an identifying name given to a street or road. In toponymic terminology, names of streets and roads are referred to as hodonyms (from Ancient Greek ὁδός / hodós - road, and ὄνομα / ónoma - name). The street name usually forms part of the address (though addresses in some parts of the world, notably most of Japan, make no reference to street names). Buildings are often given numbers along the street to further help identify them. Odonymy is the study of road names.