Degree symbol From Wikipedia; Degree Symbol Information & Uses
The degree symbol (°) is a typographical symbol that is used, among other things, to represent degrees of arc (e.g. in geographic coordinate systems), hours (in the medical field), degrees of temperature, alcohol proof, or diminished quality in musical harmony.

In the case of degrees of temperature, three scientific and engineering standards bodies (BIPM, ISO and the U.S. Government Printing Office) prescribe printing temperatures with a space between the number and the degree symbol (e.g., 10 °C).[3][4] However, in many works with professional typesetting, including scientific works published by the University of Chicago Press or Oxford University Press, the degree symbol is printed with no spaces between the number, the symbol, and the Latin letters “C” or “F” representing Celsius or Fahrenheit, respectively (e.g., 10 °C).[5][6] This is also the practice of the University Corporation for Atmospheric Research, which operates the National Center for Atmospheric Research.[7] Though not recommended, use of the degree symbol without a following Latin letter is done so without a space between the number and symbol (e.g., 10°); this is considered more acceptable if the standard of temperature is not known, but it is recommended in this case that the full word be used rather than the symbol (e.g., 10 degrees). Use of the degree symbol to refer to temperatures measured in kelvins (symbol: K) was abolished in 1967 by the 13th General Conference on Weights and Measures (CGPM). Therefore, the triple point of water, for instance, is correctly written simply as 273.16 K. The name of the SI unit of temperature is now “kelvin” (note the lower case), and no longer “degrees Kelvin”.