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91 degrees Celsius is written as 91°C (the degree symbol is on the Character Map).
The first recorded modern use of the degree symbol in mathematics is from 1569 where the usage clearly shows that the symbol is a small raised zero. (Author unknown)
You should spell out the word.
It looks like the degree symbol (°), but lower (vertically centered with the text.)
Kelvin uses the letter K as its symbol.