M0 symbol for (Economics) the amount of money in circulation in notes and coin, plus the banks’ till money and the banks’ balances at the Bank of England. Informal name: narrow money Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014