Chandigarh, a planned city designed by Le Corbusier, does not have a Sector 13 due to the superstition that the number 13 is unlucky. This is an interesting exception in the city's otherwise systematic sector numbering. Delhi, Mumbai, and Nagpur all have areas designated as Sector 13 or numbered 13 in various localities. Chandigarh's sector system jumps from Sector 12 to Sector 14.