Na?

I noticed it during my first one on one with one of the college grads in my team. He would say some sentence and tag a "Na?" to the end of it. Eg. "Food and lodging in Calcutta is much cheaper than in Bangalore, na?" Anyway, I love it when people say it, it seems to be used more among the Hindi speaking crowd. Don't be surprised if after a few years of living here, I start tagging "na" at the end my sentences instead of "eh!".