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R in Letters & punctuation topic

From Longman Dictionary of Contemporary EnglishRR1, r /ɑː $ ɑːr/ noun (plural R’s, r’s)  1 SLA[countable, uncountable] the 18th letter of the English alphabet2 [singular, uncountable] American English used to describe a film that has been officially approved as only suitable for people over 17 three Rs
Examples from the Corpus
RSenator Charles Grassley, R-Iowa