 B. D. stands for three young Indian independence freedom fighters — Benoy, Badal and Dinesh — who on 8 December 1930 shot dead the Inspector General of Prisons, N.S.Simpson, in the balconies of the Writers' Building of the then Dalhousie Square.The square had been named after Lord Dalhousie, Governor General of India from 1847 to 1856.