"Low frequency" refers to a sound or wave that occurs less often or slower compared to others. It is a term commonly used in relation to sound waves, radio signals, or oscillations. Full definition
The «low - risk» group (58 per cent) consisted of responders who had no or very low frequency of risk behaviours. (news.cision.com)
Background noise resulting from local winds and other noise sources, was shown to contribute to increases in low frequency noise that were comparable with, or higher than contributions from the wind farm. (ramblingsdc.net)
The bulk of the mutations were in very low frequencies; 99 percent were found in fewer than 100 cells. (uchospitals.edu)