R

In phonetics, rhotic consonants, or "R-like" sounds, are liquid consonants that are traditionally represented orthographically by symbols derived from the Greek letter rho (Ρ and ρ), including ⟨R⟩, ⟨r⟩ in the Latin script and ⟨Р⟩, ⟨p⟩ in the Cyrillic script. They are transcribed in the International Phonetic Alphabet by upper- or lower-case variants of Roman ⟨R⟩, ⟨r⟩: ⟨r⟩, ⟨ɾ⟩, ⟨ɹ⟩, ⟨ɻ⟩, ⟨ʀ⟩, ⟨ʁ⟩, ⟨ɽ⟩, and ⟨ɺ⟩. Transcriptions for vocalic or semivocalic realisations of underlying rhotics include the ⟨ə̯⟩ and ⟨ɐ̯⟩.

This class of sounds is difficult to characterise phonetically; from a phonetic standpoint, there is no single articulatory correlate (manner or place) common to rhotic consonants. Rhotics have instead been found to carry out similar phonological functions or to have certain similar phonological features across different languages.

The QWERTZ (/ˈkwɜːrts/ KWURTS) QWERTZU (/ˈkwɜːrtsuː/ KWURT-soo), or QWERTZUIOP keyboard is a typewriter and keyboard layout widely used in Central and Southeast Europe. The name comes from the first six letters at the top left of the keyboard: (Q W E R T Z).

AZERTY (/əˈzɜːrti/ ə-ZUR-tee) is a specific layout for the characters of the Latin alphabet on typewriter keys and computer keyboards. The layout takes its name from the first six letters to appear on the first row of alphabetical keys; that is, (A Z E R T Y). Like other European keyboard layouts, it is modelled on the English-language QWERTY layout. It is used in France and Belgium, though both countries have their own national variation on the layout.

The competing layouts devised for French (e.g. the 1907 ZHJAY layout, Arav Dixit's 1976 layout, the 2002 Dvorak-fr, and the 2005 BÉPO layout) have obtained only limited recognition, although the latter has been included in the 2019 French keyboard layout standard.

The Indian rupee sign ⟨₹⟩ is the currency symbol for the Indian rupee (ISO 4217: INR), the official currency of India. Designed by D. Udaya Kumar, it was presented to the public by the Government of India on 15 July 2010, following its selection through an open competition among Indian residents. Before its adoption, the rupee was signified by Rs (a sign shared with several other countries), by ⟨Re⟩ or, in texts in Indian languages, an appropriate abbreviation in the language used.

The design is based on the Devanagari letter ⟨र⟩ (ra) with a double horizontal line at the top and the Latin capital letter ⟨R⟩ without its vertical bar.

In organic and organometallic chemistry, an organyl group (commonly denoted by the letter "R") is an organic substituent with one or sometimes more free valence electrons at a carbon atom. The term is often used in chemical patent literature to protect claims over a broad scope.

A voiced uvular trill is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ʀ⟩, a small capital version of the Latin letter r. This consonant is one of several collectively called guttural R.