The uuid vocabulary is used to generate UUIDs. The below words can be used to generate version 1, 3, 4, and 5 UUIDs as specified in RFC 4122.

If all you want is a unique ID, you should probably call uuid1 or uuid4.
uuid1 ( -- string )

uuid3 ( namespace name -- string )

uuid4 ( -- string )

uuid5 ( namespace name -- string )