I think 3 is the magic number denoting the boundaries of the 'waves' these days:-
VLF 3kHz to 30kHz
LF 30 kHz to 300 kHz
MF 300 kHz to 3 MHz
HF 3 MHz to 30 MHz
VHF 30 MHz to 300 MHz
UHF 300Mhz to 3 GHz
SHF 3Ghz to 30 Ghz
EHF 30 Ghz to 300 Ghz
'Terrahertz Radiation' 300 Ghz and beyond
Apparently there are classifications below 3Khz for electromagnetic radiation but the aerials wouldnt fit in your back garden very well. 
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All the BBC's early broadcasts were on mediumwave. On its formation in November 1922 the BBC inherited three MW transmitters (2LO London, 2ZY Manchester, 5IT Birmingham) from its founding companies.
The 2MT Writtle experiments were IIRC at 428 KHz which was either on Longwave, Mediumwave or inbetween depending on which point one considers LW to end and MW to start.
Nowadays 279 KHz is regarded as the top end of longwave but in times past it ran up to 433 KHz
IIRC in the early days of the Daventry LW transmitter Writtle was retained as backup/standby.
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BBC Long Wave - Tom Thumb 10/7/2023, 15:48:40
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