Autonymy refers to the the actual expression which refers to the letters ‘Tokyo’ rather than the city. But this is different to Saussure’s concept of ‘Tokyo’ referring to the signifier where the it is contrasted to the concept or signified. The discussion with autonymy is similar to a Millian general term or name which refer to objects without a connection to a concept, a link between signifier (name) and object seem to be.