The name may be given in full or in a coded form. It is a repeatable subfield so that one can indicate the organizational hierarchy of the sublocation. It may show the physical location within a sublocation. There may also be a need to include information about a temporary location at the holdings level, rather than be forced to use an item field for that information. It is intended to allow for the location of an item in a collection.
Some institutions shelve portions of their collections by an alphabetic designation.
The format is ambiguous about this type of situation. It is not clear how to distinguish these situations. Another example is an item that is part a specific collection within an organizational division. The name of the collection might be considered a call number suffix or prefix, because the item is located in a separate run of the call number, rather than in the main run of the division's call numbers. In this case, there is a run of that classification number within the main Rare Book Collection and another run in the Pre-1801 Coll.