Research topic: R

R 18th letter of the alphabet , corresponding to Greek rho. When in Latin alphabets the letters for p and r became similar in appearance, the rho form (P; which at first was used for the r sound) was restricted to the p sound, and an extra line was added for the r sound (R). In Greek, where no confusion developed, the rho continued to look like Latin P. A modification of R is the symbol Rx, used medically for recipe [Lat.,=take] and liturgically for responsum [Lat.,=response]. Author not available, R. , The Columbia Encyclopedia, Sixth Edition 2007... Read more