The Indian rupee symbol seems to have changed last year. So indeed you can't use the unicode symbol which won't display on most computers until at least few years.
So, the solution will be to edit your currency via the menu System->Currencies and change the currency symbol to something like this:
<img src="
www.hikashop.com/media/kunena/attachment...ian_Rupee_symbol.png
" />
But before that, you will have to change the code:
hikashop::secureField($column);
if($column=='currency_locale'){
to:
hikashop::secureField($column);
if($column=='currency_symbol'){
jimport('joomla.filter.filterinput');
$safeHtmlFilter = & JFilterInput::getInstance(null, null, 1, 1);
$currency->$column = $safeHtmlFilter->clean($value, 'string');
}elseif($column=='currency_locale'){
in the file administrator/components/com_hikashop/classes/currency.php in order to allow HTML code in the currency symbol field.
We will include that modification in HikaShop in next release so that Indians can easily change the currency symbol to an image when they need to.