Transworld

But it doesn't really come to the same thing, because the usual notion of a criterion of transworld identity demands that we give purely qualitative necessary and sufficient conditions for someone being Nixon.

Source: wiktionary

If we start with transworld individuals which exist in several possible worlds, we can, as Lewis pointed out, construct world-specific individuals as ordered pairs, of which the first member is a transworld individual and the second member is a possible world ...

Source: wiktionary

Although this approach avoids the problem of specifying transworld identity relations, it provokes another objection concerning the essential properties that must be attributed to any individual in a world in which the individual exists.

Source: wiktionary