The theatres of Broadway and the huge number of animated neon and LED signs have been one of New York's iconic images as well as a symbol of the intensely urban aspects of Manhattan. Such signage is mandated by zoning ordinances that require building owners to display illuminated signs, the only district in New York City with this requirement. The neighborhood has a minimum limit for lighting instead of the standard maximum limit. The density of illuminated signs in Times Square rivals that in Las Vegas. Officially, signs in Times Square are called "spectaculars", and the largest of them are called "jumbotrons". This signage ordinance was implemented in accordance with guidelines set in a revitalization program that New York Governor Mario Cuomo implemented in 1993.