A search of elements becomes necessary to facilitate the understanding of the origins of the Lacan´s significant, in the attempt to explain through structural linguistic, the limits of the Saussure´s influence. It is known that the Lacan´s significant, even though has the Saussure´s influence as a reference in epistemology, both “significant” must not be mistaken. It is usually attributed to Ferdinand de Saussure the invention of the theory of the linguistic sign. We will stand out, however, that this “invention” is (...) previous to the theories of the genevan linguist. We will observe the comments of Jean-Luc Nancy and Philippe Lacoue-Labarthe, to the point where these authors demonstrate that the displacement operated on the Saussure´s scheme will not depend on, as it is well known, the significant’s autonomy. It will be verified, therefore, how legitimate it is, the use of the significant´s term in the Lacan´s theory. (shrink)