Has anyone heard of 666 in connection with illegal drug taking. if so what is it please?

The new drug, street name 666 has just entered Australia. Mainly hitting Adelaide. That is the street name where as there are other abbrieviations for it. Apparently it is 20% stronger then some type of amphetimine, not sure if its 20% stronger than ice, not quite sure but for users its meant to be super intence, Most uses are dying or most common having fits or seisures... Thats all ive seen on the news.