R is the eighteenth letter of the modern Latin alphabet. Its name in English is spelled ar (IPA: /?r/; pronounced [??] or [??]). ...
http://en.wikipedia.org/wiki/R

The R programming language, sometimes described as GNU S, is a programming language and software environment for statistical computing and graphics.
http://en.wikipedia.org/wiki/R_programming_language

R, also called GNU S, is a strongly functional language and environment to statistically explore data sets, make many graphical displays of data from custom command line, shell has ...
http://www.r-project.org/

1. the 18th letter of the English alphabet, a consonant. 2. any spoken sound represented by the letter R or r, as in ran, carrot, or rhyme.
http://dictionary.reference.com/browse/R

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