The term 'THE 'M' OF MHZ' is referring to the word 'mega', which is a unit of measurement for frequency. It is abbreviated as 'MHz' and stands for 'megahertz'. A hertz is a unit of frequency equal to one cycle per second, and a megahertz is equal to one million hertz. Therefore, the term 'THE 'M' OF MHZ' is referring to the unit of measurement 'mega' which is used to measure frequency in megahertz.