On Tue, 4 Mar 2003, Nicholas Bodley wrote:

> (A few pertinent items: "$5 dollars", "5$", "%50", the last signifying
> "half", although probably only among computer people.)

Just to note that the percent sign is officially put at the left side in
Persian texts. I don't know the reason (which probably relates in some way
to the right-to-left writing direction of Persian), but almost every
authentic source or typographic style mentions this.