(en) The typical way to identify objects and events of which we think is indexical reference; the linguistic means for indexical reference are the indexicals. The indexical terms depend on the authority of the speech and are thus dependent on a contextual relation to the referent, what means that they are indexed in the utterance. The contextual dependence sometimes took on a shape of contextualism which excludes any rigidity in the indexical reference because of the inevitabity of the multiplicity of referential instances. But the ambiguity concerned with the duplication of the reference can be raised solved within the framework of a self referential speech. Indeed, auto-designative indexicals ("I" - "here" - "now") by which the speech qualifies itself, temporarily, locally or personally (locutionary), without resorting to an index, indicate the same reference in all the circumstances, and we would say "in all the possible worlds ". To seize their relevance, it would be necessary to move from the diadic analysis, inherited from Kaplan, who distinguished the character and the content of an expression, towards a triadic approach which distinguishes character, context and possible worlds by combining the reference determiners (connected to the contexts of statement) and referential determiners (connected to possible worlds).