However , in West Bengal , Tripura , Mizoram , Orissa , and Assam , the Indian rupee is officially known by names derived from the Sanskrit word à à à à ( Tanka ) which means money . However , in Assam Valley , West Bengal , Tripura , Mizoram and Orissa , the Indian rupee is officially known by names derived from the word à à à à ( Tanka ) which means money .