ISIL (International Standard Identifier for Libraries and Related Organizations) are standard identifiers for libraries, archives, museums and related institutions in Germany since 2004. Sigel has long been the corresponding national level identifier for libraries.The ISIL-Agency at Staatsbibliothek zu Berlin acts as a national registry and provides identifiers to all relevant institutions in Germany.
Assignment is carried out on application by the German ISIL- and Library Code Agency at the Staatsbibliothek zu Berlin.