Accession number (cultural property)

In galleries, libraries, archives, and museums, an accession number or catalogue number, or various other terms, is a unique identifier assigned to each object in a collection for its identification and recording. Assignment of accession numbers typically occurs at the point of accessioning, when the object enters the collection, or sometimes in later cataloging.

"Accession number" tends to be the term in American collections, while a variety of other terms are used in other English-speaking countries. If an item is removed from the collection, its number is usually not reused for new items.