(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.