a language belongs to the general system of ‘signification’, that, in its quality as a particular, more elaborated system, it is part of the world of signifying systems, the characteristic of which is to be systems, to present signification as distributed and articulated by principles which are themselves signifying.
Benveniste argues that linguistic signification is not merely a property of individual signs but is systematically organized and reflexively structured, distinguishing language from all other semiological systems.
, Last Lectures: Collège de France 1968 and 1969, 2012thesis