I searched for Verzeichnis using a search engine and looked it up in my dictionaries. It would appear to be used for:
1) lists or catalogues of things.
Examples A thematic catalogue of a composer's works e.g. BWV (Bach Werk Verzeichnis) is the numbering system which allows identification of any of JS Bach's compositions and for Mozart "Köchel-Verzeichnis". There are similar systems for many composers.
Lists of just about anything, often in some order such as alphabetical, such as online betting agencies, lists of subsidiaries of German companies active in the USA, telephone directories, lists of courses available at a university, lists of philanthropic organisations and even "Verzeichnis der Aufzugsprüferinnen und Aufzugsprüfer gemäß § 16 des Wiener Aufzugsgesetzes 2006".
2) a directory or folder system on a computer.