Back in the 80's the currency in Peru changed from Soles (S/.) to Intis (I/.), but later in the 90's this was changed again to Nuevos Soles which maintained the old currency symbol S/.
Moodle still is stuck back in the 80's in this respect, I know it is fashionable to be retro, but you guys ought to get with the times. It ain't the 80's anymore
See the info in http://en.wikipedia.org/wiki/Peruvian_inti and also http://www1.bcrp.gob.pe/VariablesFame/Monetarias-en.pdf for more details