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There is no need for an abbreviation to represent the letter r since it is only one letter long, and is not a particularly difficult character to write.

Conversely, the letter r is used as an abbreviation to represent a number of different concepts/measures, some of which follow:

r = radius, regression coefficient, radians, the second parameter in permutations and combinations.

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Q: What is the abbreviation that represents the letter r in math?
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