ÖNB meaning in Academic & Science ?

The Austrian National Library (German: Österreichische Nationalbibliothek) is the largest library in Austria, with more than 12 million items in its various collections. The library is located in the Neue Burg Wing of the Hofburg in center of Vienna. Since 2005, some of the collections have been relocated within the Baroque structure of the Palais Mollard-Clary. Founded by the Habsburgs, the library was originally called the Imperial Court Library (German: Kaiserliche Hofbibliothek); the change to the current name occurred in 1920, following the end of the Habsburg Monarchy and the proclamation of the Austrian Republic. The library complex includes four museums, as well as multiple special collections and archives.