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M0 (M Zero) is simply how much physical American money is in circulation, both coins and bank notes. M1 is M0 plus all the money that's in a bank that someone could withdraw immediately (usually known as "checking" accounts). M2 is M1 plus other types of accounts, including money markets and smaller CDs (under 0,000).
M3, the one that will no longer be printed, is M2 plus Eurodollars. While Eurodollars sounds like plastic money used at EuroDisney, it actually refers to dollars being held in non-American banks (originally most dollars held overseas were in European banks, but "eurodollars" could just as easily be held in China).
Iran had originally scheduled to open its bourse (or stock exchange where oil could be sold and bought in Euros) in 2005. That obviously hasn't happened, but now the date is set for Spring 2006. Exactly when the Fed says it will stop printing statistics of how many dollars are in existance overseas.