What does IR mean?

Infrared (IR) refers to a region of the electromagnetic spectrum with wavelengths longer than those of visible light but shorter than microwaves.
IR is invisible to the human eye but can be detected and measured using specialized instruments and cameras.

Note:
Infrared (IR) is also known as Infrared Radiation (IR) or Infrared Light.
The term Infrared is derived from the Latin word infra meaning below, and red, referring to the fact that Infrared light has a frequency below the frequency of red light in the electromagnetic spectrum.

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