Looking for thermionic emission? Find out information about thermionic emission. emission of electrons electron, elementary particle carrying a unit charge of negative electricity. Ordinary electric current is the flow of electrons... Explanation of thermionic emission
M stands for medium width. It depends if the 10M was on a pair of mens shoes or womens shoes. A 10M in Mens shoes would be a 11 in womens shoes.
In metric units, M means mega which means million. You may see the notation Nm3/s which is a metric (SI) unit for Normal m3/s. Normal is the same as standard or base, which can be confused with Newton (unit of force) since both have the same abbreviation.