From wikipedia on Money Supply
M0: In some countries, such as the United Kingdom, M0 includes bank reserves, so M0 is referred to as the monetary base, or narrow money.[11]
MB: is referred to as the monetary base or total currency.[8] This is the base from which other forms of money (like checking deposits, listed below) are created and is traditionally the most liquid measure of the money supply.[12]
M1: Bank reserves are not included in M1.
M2: Represents M1 and "close substitutes" for M1.[13] M2 is a broader classification of money than M1. M2 is a key economic indicator used to forecast inflation.[14]
M3: M2 plus large and long-term deposits. Since 2006, M3 is no longer published by the US central bank.[15] However, there are still estimates produced by various private institutions.
MZM: Money with zero maturity. It measures the supply of financial assets redeemable at par on demand. Velocity of MZM is historically a relatively accurate predictor of inflation.[16][17][18]
