Numbering: The identification of each of the successive items of a publication. It can include a numeral, a letter, any other character, or the combination of these with or without an accompanying word (volume, number, etc.) and/or a chronological designation. (AACR2)

8.3.1. Sources

8.3.2. Types of numeric designations

8.3.3 Types of dates that may be chronological designations

See also:

Module 8. Numbering (Fields 362, 500)