Fm

Fm

prop. n.
  1. the symbol for the element Fermium.

FM

n.
  1. A method of transmitting radio signals by modulating the frequency of the carrier wave; -- opposed to AM (amplitude modulation), in which the signal modulates the amplitude, rather than the frequency of the carrier wave. [acron.]

Fm

prop. n.
  1. The chemical symbol for Fermium, a transuranic element.