an alphanumeric code used for shelving/ordering books and journals in libraries, often based on a publication's title

A unique alphanumeric code assigned to titles of serial publications; can be used for searching in some catalogs and indexes

CODEN is an alphanumeric code that uniquely identifies a specific publication. It was devised by the American Society for Testing and Materials, mainly for use on scientific and technical titles. The Chemical Abstracts Service assigns new CODENs.

The Chemical Abstracts Service assigns six-character codes to serials. The first five characters have a mnemonic relationship to the serial. The last character is an alphabetic or numeric check character. For example, AISJB6, CADIDW.

A unique six-letter character code (derived from the American Society for Testing and Materials "CODEN for Periodical Titles", which identifies periodicals, serial publications, and individual published works).

CODEN – according to ASTM standard E250 – is a six character, alphanumeric bibliographic code, that provides concise, unique and unambiguous identification of the titles of serials and non-serial publications from all subject areas.