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Definition: frequency bands

Following are the ranges of frequencies in the bands specified by the ITU. See spectrum, frequency range, satellite frequency bands, 5G frequency bands and optical bands.
 Frequency Band       From       To

 ELF  Extremely low    3 Hz    30 Hz
 SLF  Super low       30 Hz   300 Hz
 ULF  Ultra low      300 Hz     3 KHz
 VLF  Very low         3 KHz   30 KHz
 LF   Low             30 KHz  300 KHz
 MF   Medium         300 KHz    3 MHz
 HF   High             3 MHz   30 MHz
 VHF  Very high       30 MHz  300 MHz
 UHF  Ultra high     300 MHz    3 GHz
 SHF  Super high       3 GHz   30 GHz
 EHF  Extremely high  30 GHz  300 GHz
 THF  TeraHertz      300 GHz    3 THz