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This article is from the Libraries FAQ, by Anthony Wilson paw@iglou.com with numerous contributions by others.

5.5 What are the ten major classes of Universal Decimal Classification?

0: Generalities. Science and Knowledge Organization. Information
Documentation. Librarianship. Institutions. Publications.
1: Philosophy and psychology
2 : Religion and theology
3 : Social sciences; Statistics; Politics; Economics; Trade; Law;
Governments; Military affairs; Welfare; Insurance; Education; Folklore
4 : [vacant]
5 : Mathematics and natural sciences
6 : Applied Sciences
7 : The Arts. Recreation. Entertainment. Sport
8 : Language. Linguistics. Literature
9 : Geography. Biography. History

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• prev: 5.4 What are the classes of Medical Subject Headings (MeSH) & Black's Dental Classification?
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• next: 5.6 What other classification (or subject heading) systems are there? (Library)