A beat frequency oscillator or BFO in a radio receiver, is a dedicated oscillator used to create an audio frequency signal from Morse code (CW) transmissions to make them audible. The signal from the BFO is heterodyned with the intermediate frequency signal to create an audio frequency signal. BFOs are also used to demodulate single-sideband (SSB)...
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http://en.wikipedia.org/wiki/Beat_frequency_oscillator
A Beat-frequency Oscillator (B.F.O.) is a device for generating oscillations of approximately sinusoidal waveform by combining two radio-frequency electrical oscillations of different frequencies.
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http://www.probertencyclopaedia.com/browse/GB.HTM
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