On 5 March 2009, the Indian government announced a contest to create a sign for the Indian rupee. During the 2010 Union Budget.
The new sign is a combination of the Devanagari letter "र" (ra) and the Latin capital letter "R" without its vertical bar (similar to the R rotunda). The parallel lines at the top (with white space between them) are said to make an allusion to the tricolor Indian flag.[10] and also depict an equality sign that symbolizes the nation's desire to reduce economic disparity.
this symbol created by D Udaya Kumar, son of N. Dharmalingam, a former DMK MLA
Let clear the question first that, my question is, in any currency like USD($, yen, pound, euro and another) sometimes these symbols have single line or double line, again my question is, what is effect and meaning of same i.e. single line or double line.