Popularly called as the Manchester of South India, the city is known for its industries and has developed a reputation for entrepreneurship.[13][14][15] Coimbatore also has a large number of Telugus,[16] Kannadigas, Malayalis,[17][18][19] mainly from Palakkad and North Indians,[20] mainly Gujaratis,[21] who are engaged in trade and commerce.During the 1970s the city witnessed a population explosion as a result of migration fueled by increased economic growth and job opportunities.[39] Christian missions date back to the 17th century when permission was granted by the Nayak rulers to set up churches in the region.[42] Eating on a banana leaf is an old custom and imparts a unique flavor to the food and is considered healthy.Ariseemparuppu or arisi paruppu satham (literally translated as Rice and dal) originated from Coimbatore and the people of the city celebrate January 8 as national Aruseemparuppu day, after given light by a popular influencer and food consultant.One of the examples is the use of ங் to end a word like வாங் "vaang", means 'come' expressed in a respectful tone, which in standard Tamil would be "vaanga".