Wilhelm Wien refers to the German physicist Wilhelm Wien, who is best known for his contributions to the field of thermodynamics and radiation. He was born on January 13, 1864, and died on August 30, 1928. Wien's most significant work is related to "Wien's displacement law," which describes how the wavelength at which the emission of a black body spectrum is maximized shifts to shorter wavelengths as the temperature increases.
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A physicist.[ref]
https://www.uni-wuerzburg.de/uniarchiv/persoenlichkeiten/gelehrtentafeln/wilhelm-wien/. Independent biographical identity and professional specialization
Wien's displacement law connects a thermal spectrum's peak position to temperature. Specifying whether the spectrum is expressed per unit wavelength or per unit frequency is essential to stating which peak is meant.