Edited sentence: (Outside The Perimeter) to refer to an act or way of living that is peculiar to either downtown and the intown neighborhoods or the suburbs.Atlantans use the acronyms I.I-285 is considered something of a lifestyle divider and has spawned some widely-used slang terms.P (Inside The Perimeter) or O.The Perimeter was once the boundary between area codes 404 (Atlanta) and 770 (suburban Atlanta), and Atlantans also refer to the suburbs as "770 Land"