very low frequency
very low frequency definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any radio frequency between 10 and 30 kilohertz
very low frequency definition by American Heritage Dictionary
noun Abbr. VLFThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A band of radio frequencies falling between 3 and 30 kilohertz.
very low frequency - Computer Definition