This chapter provides an account of the ways in which autistic foreclosure impacts the structuring of autistic linguistic functionality. More specifically, it provides an account of the varying degrees of the unique autistic mode of access to language that is rooted in a fundamental refusal of the domain of signifiers. The first section provides an account of the autistic lack of access to the locus of the Other. The second section unravels a comprehensive account of the notion of the “sign” in Lacan’s teaching and its distinction from the “signifier.” On the basis of this distinction, the unique autistic mode of access to language is associated with the subjective recourse to the sign. The final section provides an integrative model through which the varying degrees of autistic linguistic functionality can be understood. This section discloses an alternative framework for the understanding of the varying degrees of symptomatic severity confronted in the clinic of autism—commonly designated today, in the psychiatric domain, on the “autism spectrum”—and introduces a new model for the clinic of autism that is based on the newly derived notion of the “autistic linguistic spectrum.”