AM-Amplitude modulated
FM-Frequency modulated
Explanation: The frequency and amplitude refer to the width and height of wavelengths in the radio waves that are used to transmit the signal. FM is usually a better signal than AM because the frequency of the waves is less distorted than amplitude.
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Security,location,communication,terrain,observation, position improvement. Ref fm 6-30 fm 3-09.30 OP Occupation.
You mean "What is FM the abbreviated form of?"? You can't abbreviate "fm". FM is the abbreviated form of "Frequency Modulation".
AM = Amplitude Modulation. FM = Frequency Modulation
If the letters are in front of the road number, ie. FM 289, the FM means Farm to Market, indicating it is a rural non-major highway (except in the outskirts of heavily populated areas).
There are several meanings for the abbreviation. One example is: WTTS is an FM radio station serving Indianapolis and Bloomington, Indiana, in the United States, broadcasting at 92.3 FM.