It's mediaeval Indian. The language on it is Arabic. "Sultanate of Dehli" is almost always the origin of these pieces, but I'm not proficient enough in the series to give you a more precise ID. These very dark-coloured coins are often made of "billon", a very debased silver alloy.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis