Rupees, Rs., or INR

I don't readily know how the American dollar's "$" became an "s" with a line through it; however, here's a quick link to explain how the Indian Rupee is getting a new symbol. Pretty simple, really, it was a contest:

http://www.indianexpress.com/news/iit-postgraduate-gives-rupee-its-symbol/646761/

If only I had a key on my keyboard that represented "an amalgam of the Devanagari 'Ra' and the Roman capital 'R' without the stem". I guess until that time I'll just continue alternating inconsistently between "Rs." and "INR".