A social domain described by Jacques Lacan as:
The big Other designates radical alterity, an other-ness which transcends the illusory otherness of the imaginary because it cannot be assimilated through identification. Lacan equates this radical alterity with language and the law, and hence the big Other is inscribed in the order of the symbolic. Indeed, the big Other is the symbolic insofar as it is particularized for each subject. The Other is thus both another subject, in his radical alterity and unassimilable uniqueness, and also the symbolic order which mediates the relationship with that other subject.
This domain of group identity, that ‘cannot be assimilated through identification [with the individual self], but is mediated through the various things in the symbolic domain (i.e. -isms like communism, fascism, or vegetarianism), is the social domain governed by oxytocin.