Ŕ
Ŕ (minuscule: ŕ) is a letter of the Lower Sorbian and Slovak alphabets, Ukrainian Latin alphabet and Proto-Turkic orthography. It is formed from R with the addition of an acute. Their Unicode codepoints are U+0154 Ŕ LATIN CAPITAL LETTER R WITH ACUTE (Ŕ) and U+0155 ŕ LATIN SMALL LETTER R WITH ACUTE (ŕ). The PostScript names are Racute and racute.
Slovak
In Slovak ⟨ŕ⟩ is used to represent /r̩ː/, the geminate syllabic alveolar trill.
Lower Sorbian
It is used in Lower Sorbian to represent /rʲ/, the palatalised alveolar trill.
Basque
In Sabino Arana's orthography[1] of the Basque language, ⟨ŕ⟩ was used for the /r/ contrasting with ⟨r⟩ which was used for /ɾ/. However, in the standard Basque alphabet, /r/ is represented with ⟨r⟩ in syllable-final positions and ⟨rr⟩ between vowels.