ultralow frequency

ul·tra·low frequency

 (ŭl′trə-lō′)
n. Abbr. ULF
An electromagnetic wave whose frequency is less than 3,000 hertz.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The new energy harvesting system is described in a paper titled "Ultralow Frequency Electrochemical Mechanical Strain Energy Harvester using 2D Black Phosphorus Nanosheets" published Jun.21 online by the journal ACS Energy Letters.
Chen, "Study on ultralow frequency parallel connection isolator used for precision instruments," China Mechanical Engineering, vol.
(the authors hypothesized an alternative classification for temporomandibular disorders based on the presence of central sensitization and on individual response to sensory ultralow frequency transcutaneous electrical nerve stimulation); and finally the article "Effectiveness of Low-Level Laser Therapy in Reducing Orthodontic Pain: A Systematic Review and Meta-Analysis" by N.