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.
M stands for 1000 in Roman numerals, but when people write 10M they normally mean 10 million, not 10 thousand (which, as you have noticed, is written 10K). Just an annoying confusion.