What does NIS stand for? 

Niš

Niš (; Serbian Cyrillic: Ниш, Serbian pronunciation: [nîːʃ] (listen); names in other languages) is the third largest city in Serbia and the administrative center of the Nišava District. It is located in southern part of Serbia. According to the 2011 census, the city proper has a population of 183,164, while its administrative area (City of Niš) has a population of 260,237 inhabitants.Several Roman emperors were born in Niš or used it as a residence: Constantine the Great, the first Christian emperor and the founder of Constantinople, Constantius III, Constans, Vetranio, Julian, Valentinian I, Valens; and Justin I. Emperor Claudius Gothicus decisively defeated the Goths at the Battle of Naissus (present-day Niš). Later playing a prominent role in the history of the Byzantine Empire, the city's past would earn it the nickname Imperial City.After about 400 years of Ottoman rule, the city was liberated in 1878 and became part of the Principality of Serbia, though not without great bloodshed—remnants of which can be found throughout the city. Today, Niš is one of the most important economic centers in Serbia, especially in the electronics, mechanical engineering, textile, and tobacco industries. Constantine the Great Airport is Niš's international airport. The city is also the seat of the University of Niš, the Eparchy of Niš and the Command of Serbian Army. In 2013, the city was host to the celebration of 1700 years of Constantine's Edict of Milan.

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