Infrared
lastmod 2018-08-17created 2017-03-023 edits
Infrared (also called neomppalgangsal, a native Korean coinage meaning "beyond red") is a type of electromagnetic wave with a longer wavelength than visible light and a shorter wavelength than the microwaves used in microwave ovens. In everyday life, when you bring your skin close to an object giving off heat in the dark, you can feel its warmth; this is infrared.
Meaning
Infrared is a word formed by adding the Latin 'infra' (below), meaning 'below red'. That is, infrared has a longer wavelength than the red region of visible light (about 500~780nm).
Hence, using InfraRed, it is abbreviated as IR.