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ITU Radio Bands(国际电信联盟)  -- From wiki pedia	https://en.wikipedia.org/wiki/Extremely_low_frequency

Name Frequency F.Unit(hertz) Wave Length Full Name

ELF 3-30 Hz 100km~10km Extremely Low Frequency
SLF 30-300 Hz 10km~1km Super Low Frequency
ULF 300-3000 Hz 1km~100m Ultra Low Frequency
VLF 3000-30000 Hz 100m~10 Very Low Frequency

LF 30-300 MHz 10~1km Low Frequency
MF 300~3000 MHz 1000~100m Medium Frequency
HF 3000~30000 MHz High Frequency

VHF 30~300 GHz Ultra High Frequency
UHF 300~3000 GHz Super High Frequency
SHF 3000~300000 GHz Very High Frequency
EHF 300000~3000000 GHz
THF 3000000~30000000 GHz Terahertz High Frequency

https://en.wikipedia.org/wiki/Radio_spectrum#ITU