Starting from Leibniz's principle of identity as the indistinguishable, Milner defines the indistinguishable names as elements of language that always remain the same, yet do not constitute identity; instead, they demand a thinking of truth effects and a non-identitarian connection. In the encounter of modern linguistics and psychoanalysis, Lacanian figures such as the triad, the real, the symbolic, the imaginary, and the name of the non-objectifiable of language (lalangue) are explained and commented upon. Together with "The Bright Work," this volume represents the most philosophically demanding and simultaneously clearest commentary on Lacanian psychoanalysis.