Found:
Rigid designator
SEMANTICS: an expression that refers to the same entity in every
possible world. According to Kripke (1972), this is the case with proper
names, i.e. names of individuals. The definite description the president
of the US may refer to different persons in different worlds, but the
denotation of the proper name Richard Nixon is the same person in
every possible world. Kripke accounts for the relation between a name and its
bearer by a causal theory of reference: the first use of a name for an individual
determines its designation independent of its meaning properties (initial
baptism). Kripke (1972) made the claim that natural kind terms (i.e. names
of biological sorts, natural or mineral substances) are also rigid designators.
LIT. | Gamut, L.T.F. (1991) Kripke, S.A. (1972) |