For K (Kelvin) we have a term and definition in Photography.

Thermodynamic temperature scale measurement. In 1933, the International Committee of Weights and Measures adopted the temperature at which water, ice, and water vapor coexist in equilibrium as a fixed point, the "triple point of water"; its value was set as 273.16. The unit of temperature on this scale is called the Kelvin, after William Thompson Lord Kelvin, and its symbol is K (no degree symbol used). In photography it is used to measure the color temperature of light at different wavelengths.
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