Umbilicus urbis Romae
The Umbilicus Urbis Romae (Classical Latin: [ʊmbɪˈliːkʊs ˈʊrbɪs ˈroːmae̯])—"Navel of the City of Rome"—was the symbolic centre of the city, a reference point from which, and to which, all distances in Ancient Rome were measured. It was situated in the Roman Forum, where its remnants can still be seen.