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R (named ar/or "R", Oxford English Dictionary || /ˈɔr/ 2nd edition (1989); "ar", op. cit; a pronunciation is common in Ireland.[1]) is the 18th letter of the and the ISO basic Latin alphabet.


History
Egyptian hieroglyph
tp (D1)
Phoenician
Archaic Greek/Old Italic
Rho
Roman square capital
R
15th century Florentine
inscriptional capital
blackletter ( Fraktur)German modern cursive
(D'Nealian 1978)
D1


Antiquity
The original Semitic letter may have been inspired by an Egyptian hieroglyph for tp, "head". It was used for by Semites because in their language, the word for "head" was rêš (also the name of the letter). It developed into Greek 'Ρ' ῥῶ ( rhô) and Latin R.

The descending stroke develops as a graphic variant in some Western Greek alphabets (writing rho as ), but it was not adopted in most Old Italic alphabets; most Old Italic alphabets show variants of their rho between a "P" and a "D" shape, but without the Western Greek descending stroke. Indeed, the oldest known forms of the Latin alphabet itself of the 7th to 6th centuries BC, in the Duenos and the Forum inscription, still write r using the "P" shape of the letter. The inscription shows the form of the Latin alphabet around 500 BC. Here, the rounded, closing Π shape of the p and the Ρ shape of the r have become difficult to distinguish. The descending stroke of the Latin letter R has fully developed by the 3rd century BC, as seen in the Tomb of the Scipios sarcophagus inscriptions of that era. From around 50 AD, the letter P would be written with its loop fully closed, assuming the shape formerly taken by R.


Cursive

The minuscule (lowercase) form ( r) developed through several variations on the capital form. Along with Latin minuscule writing in general, it developed ultimately from via the script of Late Antiquity into the Carolingian minuscule of the 9th century.

In handwriting, it was common not to close the bottom of the loop but continue into the leg, saving an extra pen stroke. The loop-leg stroke shortened into the simple arc used in the Carolingian minuscule and until today.

A calligraphic minuscule r, known as (ꝛ), was used in the sequence or, bending the shape of the r to accommodate the bulge of the o (as in oꝛ as opposed to or). Later, the same variant was also used where r followed other lower case letters with a rounded loop towards the right (such as b, h, p) and to write the geminate rr (as ꝛꝛ). Use of r rotunda was mostly tied to typefaces, and the glyph fell out of use along with blackletter fonts in English language contexts mostly by the 18th century.

used a minuscule which retained two downward strokes, but which did not close the loop ("Insular r", ꞃ); this variant survives in the popular in Ireland until the mid-20th century (but now mostly limited to decorative purposes).


Name
The name of the letter in Latin was er (), following the pattern of other letters representing , such as F, L, M, N and S. This name is preserved in and many other languages. In , the name of the letter changed from to , following a pattern exhibited in many other words such as farm (compare French ferme), and star (compare German Stern).

In the letter is called or .

The letter R is sometimes referred to as the littera canina (canine letter). This phrase has Latin origins: the Latin R was to sound like a growling dog. A good example of a trilling R is the Spanish word for dog, perro.

In William Shakespeare's Romeo and Juliet, such a reference is made by Juliet's nurse in Act 2, scene 4, when she calls the letter R "the dog's name". The reference is also found in 's English Grammar.


Use in writing systems

English
The letter is the eighth most common letter in and the fourth-most common consonant (after , , and ).

The letter is used to form the ending "-re", which is used in certain words such as centre in some varieties of English spelling, such as . also uses the "-re" ending, unlike , where the ending is usually replaced by "-er" ( center). This does not affect pronunciation.


Other languages
represents a [[rhotic consonant]] in many languages, as shown in the table below.
     

some dialects of or in emphatic speech, standard , , Galician, in some dialects, Hungarian, Icelandic, , , Lithuanian, , , Norwegian mostly in the northwest, , , Portuguese (traditional form), Romanian, , , and Albanian , ,
Alveolar approximant (most varieties), in some Dutch dialects (in specific positions of words), , Sicilian
/ Portuguese, , and Albanian , , , , Venetian, Galician, , Norwegian,
Voiced retroflex fricative Norwegian around Tromsø; used as an allophone of /r/ in some South American accents; used before vowels, as in raana, "toad", from Spanish rana; transliteration of .
Retroflex approximant some dialects (in the , South West England, and ),
Norwegian when followed by , sometimes in
stage standard; some dialects (in Brabant and Limburg, and some city dialects in The Netherlands), in Southern Sweden, Norwegian in western and southern parts, Venetian only in area.
Voiced uvular fricative , , , standard European Portuguese , standard Brazilian Portuguese , Puerto Rican Spanish and 'r-' in western parts, Norwegian in western and southern parts.

Other languages may use the letter in their alphabets (or Latin transliterations schemes) to represent rhotic consonants different from the alveolar trill. In , it represents a sound so weak that it is often written interchangeably with , e.g. 'Kweyol' for 'Kreyol'.

Brazilian Portuguese has a great number of allophones of such as , , , , , and , the latter three ones can be used only in certain contexts ( and as ; in the syllable coda, as an allophone of according to the European Portuguese norm and according to the Brazilian Portuguese norm). Usually at least two of them are present in a single dialect, such as Rio de Janeiro's , , and, for a few speakers, .


Other systems
The International Phonetic Alphabet uses several variations of the letter to represent the different rhotic consonants; represents the .


Related characters

Descendants and related characters in the Latin alphabet
  • R with : Ŕ ŕ Ɍ ɍ Ř ř Ṙ ṙ Ȑ ȑ Ȓ ȓ Ṛ ṛ Ṝ ṝ Ṟ ṟ Ꞧ ꞧ Ɽ ɽ R̃ r̃ ᵲ
  • International Phonetic Alphabet-specific symbols related to R: ʶ
  • Obsolete and nonstandard symbols in the International Phonetic Alphabet: ɼ ɿ
  • Uralic Phonetic Alphabet-specific symbols related to R:
  • phonetic transcription-specific symbols related to R:
  • ⱹ : Turned r with tail is used in the Swedish Dialect Alphabet
  • Other variations of R used for phonetic transcription: ʳ ʵ


Calligraphic variants in the Latin alphabet


Ancestors and siblings in other alphabets
  • 𐤓 : Semitic letter , from which the following letters derive


Abbreviations, signs and symbols
  • ℟: symbol for "response" in liturgy
  • ℞ : Medical prescription Rx
  • ₽ : Ruble symbol
  • ® : Registered trademark symbol


Physics
Relectrical resistance (Ω)
unitless
per kelvin (J/kgK)
r (m)
rradius of rotation or distance between two things such as the masses in Newton's law of universal gravitation (m)


Encoding
1


Other representations

External links
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