Sun Microsystems StorageTek 6140 Administration Manual page 183

World Wide Name. A unique 64-bit number assigned by a recognized
WWN
naming authority such as the Institute of Electrical and Electronics
Engineers (IEEE) that identifies a connection (device) or a set of
connections to the network. The World Wide Name (WWN) is constructed
from the number that identifies the naming authority, the number that
identifies the manufacturer, and a unique number for the specific
connection.
Glossary 167