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LF(1) See line feed.
(2) (Low Frequency) A range of radio frequencies from 30 to 300,000 Hz. The LF band is used for atomic clock time signals, amateur radio in various parts of the world, submarine communications, ground-based navigation and other radio-based systems.
With regard to audio, low-frequency waves are typically under 800 Hz. See frequency bands, high frequency, VHF, UHF and spectrum.