UNESCO nomenclature

UNESCO Nomenclature (more properly UNESCO nomenclature for fields of science and technology) is a system developed by UNESCO for classification of research papers and doctoral dissertations. There are three versions of the system, offering different levels of refinement through 2-, 4-, and 6-digit codes.

Two-digit system
11 Logic

12 Mathematics

21 Astronomy, Astrophysics 22 Physics

23 Chemistry

24 Life Sciences

25 Earth and space science

31 Agricultural Sciences

32 Medical Sciences

33 Technological Sciences

51 Anthropology

52 Demography

53 Economic Sciences

54 Geography

55 History

56 Juridical Science and Law

57 Linguistics

58 Pedagogy

59 Political Science

61 Psychology

62 Sciences of Arts and Letters

63 Sociology

71 Ethics

72 Philosophy