M0 is a specific Monetary policy coordinate in the Bitcoin knowledge graph. In practical terms, it identifies the subject described here: A label often used for physical currency or the narrowest monetary aggregate; official definitions are not globally uniform. This definition is narrower than promotional usage and should be read together with the implementation, date and evidence attached to the entry.
M0 is best understood as part of a system rather than as an isolated definition. Its related coordinates show the mechanisms, incentives and historical records that give the term practical meaning.
M0 is an analytical lens, not a slogan or automatic proof that every claim about Bitcoin is correct. Use it to trace scarcity, incentives, prices, time and human choice, then compare the reasoning with the protocol’s verifiable rules.
Understanding M0 helps distinguish a verifiable Bitcoin mechanism or historical record from slogans, products and market narratives.
Primary or authoritative records make these details checkable: M0 is an informal narrow-money label often used for physical currency or a monetary base subset, but its components are not standardized globally and some central banks publish reserve money under different names. They should be verified before using the coordinate in analysis.
The practical limit is: M0 must not be compared across jurisdictions or time without checking the issuing authority's definition; it is not automatically identical to the monetary base, notes in circulation or money available for household spending. A definition, office, chart pattern or published claim is not by itself a prediction or Bitcoin consensus rule.
For the clearest picture, read this entry together with Monetary base, M1, M2, Bitcoin. The reverse links also lead from Monetary base, M1, M2.