Comment by inigyou

3–30 Hz Extremely low frequency

30–300 Hz Super low frequency

300–3000 Hz Ultra low frequency

3–30 kHz Very low frequency

30–300 kHz Low frequency

300 kHz – 3 MHz Medium frequency

3–30 MHz High frequency

30–300 MHz Very high frequency

300 MHz – 3 GHz Ultra high frequency

3-30 GHz Super high frequency

30–300 GHz Extremely high frequency

300 GHz – 3 THz Tremendously high frequency