R is the eighteenth (number 18) letter in the English alphabet.
Images for kids
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The word prognatus as written on the Sarcophagus of Lucius Cornelius Scipio Barbatus (280 BC) reveals the full development of the Latin R by that time; the letter P at the same time still retains its archaic shape distinguishing it from Greek or Old Italic rho.
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18th-century example of use of r rotunda in English blackletter typography
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Letter R from the alphabet by Luca Pacioli, in De divina proportione (1509)
See also
In Spanish: R para niños