very low frequency
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Related to very low frequency: medium frequency
very low frequency[¦ver·ē ¦lō ′frē·kwən·sē]
The band of frequencies from 3 to 30 kilohertz in the radio spectrum, corresponding to wavelengths of 10 to 100 kilometers. Abbreviated VLF.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.