The MULTINATIONAL keyword defines the name of the default collation sequence for the user to be one of the International sort orders. See SQL Data Manipulation Language.
The MULTINATIONAL parameter determines that the International sort order is to be used. This parameter returns an error unless the hashing algorithm is set to recognize diacritical characters.
On International/European sites MULTINATIONAL collation is two-level.
On Japanese language sites, collation is single-level and is always available.