- high frequencyalso HF
- (Internet) have fun
- (electronics) Initialism of high frequency.
- Abbreviation of have fun.
(High Frequency) A range of radio frequencies from 3 to 30 MHz. The HF band is used for amateur radio, marine, aviation and military communications and high-frequency RFID tags. With regard to audio, high-frequency waves are typically above 3,000 Hz. See frequency bands.