Symbol like $ (US Dollar), £ (Great Britain pound), € (Euro), ¥ (Japanese Yen)
ast date for submittion of entries is 15th April 2009.
According to PDF,
The symbol has to be either in the Indian National Language Script or a visual representation but should be applicable to the standard computer keyboard.
http://finmin.nic.in/the_ministry/dept_eco_affairs/currency_coinage/Comp_Design.pdf (details)
So be creative and do try a shot. Best of luck!
Thanks,
Aji