r · character, numeral1
Old English lower case letter r, from 7th century replacement by Latin lower case r of the Anglo-Saxon Futhorc letter ᚱ.
r · verb, determiner2
R · character, numeral3
From the Etruscan letter 𐌓 (r, “er”), from the Ancient Greek letter Ρ (R, “rho”), derived from the Phoenician letter 𐤓 (r, “reš”), from the Egyptian hieroglyph 𓁶.
R · noun, adjective, proper noun4
Abbreviations.
R · pronoun5
See I.
Etymology from Wiktionary, CC BY-SA 4.0.