M0 (M followed by zero) or M-0 may refer to: Companies Aero Mongolia, an airline based in Ulaanbaatar, Mongolia (IATA designation M0) Places Megyeri Bridge (formerly known as Northern M0 Danube bridge), a bridge crossing the Danube River M0 motorway (Hungary), a ringroad around Budapest Other uses M0 (economics), the monetary base regarding the money supply MØ (born 1988), Danish singer and songwriter M0, a non-small-cell lung carcinoma staging code for no distant metastasis M0, a type of macrophage, a type of defensive phagocytic cell in living things Hayes command set M0, a command for turning a modem speaker off Measure zero, or M0, the size of the null set M0 macrophage, a phenotype of macrophage See also Mo (disambiguation) μ, the vacuum permeability , the solar mass