There are many scales to denote the Electromagnetic Spectrum. The Frequency Scale and the Wavelength Scale.
Other scales are used, such as wave number and energy. Each scale is subdivided into bands.
To Illustrate the EMS:
Gamma Ray Spectrum/Gamma Rays
X-Ray Spectrum/X-Rays
Ultraviolet Spectrum/UV/Ultraviolet
Visible Spectrum/Visible
Infrared Spectrum/Infrared
Microwave Spectrum/Microwaves
Radio Spectrum/Radio Waves
1 - 10^4: Long
Radio Waves
10^5 - 10^6:
Amplitude Modulation Radio Waves
10^6 - 10^7:
Citizen Band Radio Waves
10^8:
Frequency Modulation Radio Waves
10^9 - 10^12:
Microwaves 10^11 - 10^15:
Infrared Waves
10^15:
Visible Spectrum
10^15 - 10^17:
Ultraviolent Waves
10^16 - 10^19:
X-Rays 10^19 - 10^23:
Gamma Rays
[Editor's note (Gz), 10/4/2002: Consolidated three E1 writeups here.]