Magento Community Edition, 1.9.x
To customize currency symbols:
|1.||On the Admin menu, select System > Manage Currency > Symbols.|
Each enabled currency for your store appears in the Currency list.
|2.||Enter a custom symbol for each currency you want to use, or select the Use Standard checkbox to the right of each currency.|
|3.||If you want to override the default symbol, clear the Use Standard checkbox. Then, enter the symbol you want to use.|
It is not possible to change the alignment of the currency symbol from left to right.
|4.||When complete, click the Save Currency Symbols button.|