Accession number (library science)
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If an item is removed from the collection, its number is usually not reused for new items.
Typically, an accession number consists of the year acquired, sometimes the full date (as at the British Museum), and a sequential number separated by a period. In addition, departments or art classifications within the collection or museum may reserve sections of numbers. For example, objects identified by the numbers 11.000 through 11.999 may indicate objects obtained by the museum in 1911; the first 300 numbers might be used to indicate American art, while the next fifty (11.301-350) might be used for African art.
In older institutions, simpler numbering systems are sometimes maintained alongside, or incorporated within, newer systems. Where the objects are unique, institutions normally need to retain the original number in some form as it will have been used in old references that are still of use in scholarship. In particular, collections of manuscripts use the prefix "MS", and many well known manuscripts are known by their old MS numbers, often incorporating a prefix for a particular collection within a library. These collections may be divided by former owners, as with several British Library "closed" collections, or by language, as with Froissart of Louis of Gruuthuse (BnF MS Fr. 2643-6), indicating a two volume manuscript in French at the Bibliothèque nationale de France.