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Full Idea
By 'rigid designator' I mean a term that designates the same object in all possible worlds.
Gist of Idea
A 'rigid designator' designates the same object in all possible worlds
Source
Saul A. Kripke (Identity and Necessity [1971])
Book Ref
'Meaning and Reference', ed/tr. Moore,A.W. [OUP 1993], p.172
A Reaction
I am persistently troubled by the case of objects which are slightly different in another possible world. Does 'Aristotle' refer to him as young or old? Might the very same man have had a mole on his cheek?