In addition to frequency, which of the following is used to identify amateur radio bands?
Why Hams name bands by their approximate wavelength in meters as well as by frequency, so 146 MHz is the 2 meter band and 14 MHz is the 20 meter band. The link is wavelength in meters = 300 divided by frequency in MHz, since radio waves travel at about 300,000,000 meters per second. The rounded wavelength becomes the band's everyday name: 144-148 MHz is 2 meters, 420-450 MHz is 70 centimeters.
Watch out Channel numbers are used by broadcast TV, CB and marine VHF services, not by amateur bands, which are continuous frequency ranges you tune anywhere within. Letter/number designators like L-band or S-band belong to radar and satellite engineering, not to ham band names.
300 divided by MHz gives meters: 300/146 is about 2, hence the 2 meter band.