This poster includes all known ranges of electro-magnetic radiation including Gamma Rays, X-Rays, Ultraviolet Light, Visible Light, Infrared Light, Microwaves, Radio Waves (ULF, VLF, LF, MF, HF, Long Wave, Short Wave, HAM, VHF, UHF, SHF, EHF), Cosmic Microwave Background Radiation, and Brain Waves; all organised by octaves. The audio frequency spectrum is also included. Descriptions are included for of all ranges and properties of EMR including reflection, refraction, LASER, television, gravity waves, emission and absorption, also a handy SI units chart is included. The poster was developed by Unihedron - a multi-faceted research organisation based in Grimsby, Ontario, Canada. The size of the poster is 61 centimetres by 91 centimetres (24 inches by 36 inches).