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The Skull Tower (Serbian: Ћеле Кула; Ćele kula, pronounced [tɕel̩e kula]) is a stone structure embedded with human skulls located in Niš, Serbia. It was constructed by the Ottomans following the Battle of Čegar of May 1809, during the First Serbian Uprising. During the battle, Serbian rebels under the command of Stevan Sinđelić were surrounded by the Ottomans on Čegar Hill, near Niš.

The University of Niš Faculty of Science and Mathematics (Serbian: Природно-математички факултет Универзитета у Нишу, romanized: Prirodno-matematički fakultet Univerziteta u Nišu), also known as the Niš Faculty of Science and Mathematics, is one of the educational institutions of the University of Niš, Serbia.