"Ice", also known as "shabu", "crystal" and/or "crystal meth", is a crystalline form of high purity methamphetamine which is imported from Asian countries. Australian Customs Service figures indicate that importations of ice have increased significantly in recent years.
And from "Queensland Party Drug Trends 2001": Findings from the Illicit Drug Reporting System (IDRS) Party Drugs Module, National Drug and Alcohol Research Centre Technical Report no 133:
18.4 SHABU
18.4.1 Types of shabu
21% of the sub-group had used shabu. Dealers were reported to have told users the drug was a either a mixture of cocaine and ampetamine (33%); a form of amphetamine (33%); or ice (33%). Most users were unsure of what the drug actually was (67%) or were convinced that it was cut speed (33%).
The same report defines ice as "a strong form of methamphetamine" and says that common street names for ice are "crystal meth", "meth" and "shabu". A new street name identified was "putih", meaning white.
To add to johnboy's comments, while I'm sure that 4-MAR is sometimes found in Australia, it's pretty uncommon. It would often be sold as ice or shabu because without testing it's hard to tell the difference between 4-MAR and methamphetamine crystals - and from reports on Bluelight and Erowid the subjective experience sounds somewhat similar too.