degree Fahrenheit

https://doi.org/10.1351/goldbook.D01562
Non-SI unit of Fahrenheit temperature, °F = 5/9 K. The Fahrenheit temperature is related to the Celsius temperature by θF/°F = 9/5.(θ/°C) + 32.
Source:
Green Book, 2nd ed., p. 113 (https://dev.goldbook.iupac.org/files/pdf/green_book_2ed.pdf)