'Hindu' is ultimately derived from the name of the Indus River, and
originally meant 'Indian'; Dr. Ambedkar rightly points out in
Section 6 that it's not an Indic word. Its early history in
English and other European languages is chronicled in the
British colonial
dictionary Hobson-Jobson. Dr. Ambedkar identifies it
throughout this essay with belief in the four traditional
hierarchically organized Varnas of the Caste System; see especially Section
15.