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# Science Fair Project Encyclopedia

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# R

R is the eighteenth letter of the Latin alphabet.

Semitic Rêš (the head) developed into Greek Ρω (Rô). The sound value /r/ however was maintained in Greek as well as Etruscan and Latin. The finishing stroke was added to the Greek Rho to distinguish it from a later form of the Greek Pi, at a time when there were only capital letters in Latin. It is usually one of the liquid consonants, though there are many ways it is pronounced in European languages.

In typography, there was once a form called the half r, which was lost before the long s was.

Romeo represents the letter R in the NATO phonetic alphabet.