The DIN standard DIN 91379: "Characters and defined character sequences in Unicode for the electronic processing of names and data exchange in Europe, with CD-ROM"[1] defines a normative subset of Unicode Latin characters, sequences of base characters and diacritic signs, and special characters for use in names of persons, legal entities, products, addresses etc. The standard defines a normative mapping of Latin letters to base letters A-Z as an extension of the recommendations of ICAO.[2]
In the informative part of the standard, a set of extended characters is defined, which includes Greek and Cyrillic letters as well as other special characters for names of legal entities and product names.