I had to think for a second to realize that HF means lower frequency than VHF, not high frequency in an absolute sense.
Back in ye olden days, HF was really high! What we'd consider today to be near useless due to limited bandwidth and insane antenna requirements were once the primary frequencies for communications.
It's very silly that "high frequency" is among the lowest frequencies, and that we wound up with Very, Ultra, Super, Extremely, and Tremendously High Frequencies!