Dream symbols starting with the Letter M ( Mj to Mz) are being described here.
Money: Money in a dream can be indicative of one’s perceived  self-worth.
Monk: A spiritual, possibly guiding aspect of self.
Morning: May signify the beginning of a cycle.
Mosquito: These insect in a dream are associated with irritation.
Motel, hotel: As house represents self, motel [...]

Dream Symbols starting with the letter M (range Mf to Mi).
Microscope : Microscope in a dream may be associated with close inspection and investigation.
Migrate, emigration : Associated with changes in lifestyle, habits and/or beliefs.
Military, armed forces, army, soldier : Signifies the mental,  masculine and organising aspect of self. Could also signify mental rigidity and regimentation.
Mirror [...]

Exploring Dream Symbols from Ma to Me.
Machinery/machine may symbolise repetitive, rigid and mechanical outlook, mindset or behaviour.
Magic : 1. Denotes illusion, delusion and deception.
2. Denotes manifesting magic in one’s life.
3. Associated with wisdom.
4. Associated with the magician aspect of oneself that is more creative than believed to be.
Magnet : Symbolic representation associated with attraction and [...]