Ř
The grapheme Ř, ř (R with háček) is used in the Czech, Silesian and Upper Sorbian alphabets.
Usage
In Czech it is used to denote [r̝], a raised alveolar trill. Its manner of articulation is similar to other alveolar trills but the tongue is raised; it is partially fricative. It is usually voiced but it also has a voiceless allophone [r̝̊] occurring in the vicinity of voiceless consonants.
In Upper Sorbian, it denotes the voiceless postalveolar fricative [ʃ].
In Silesian, it denotes the voiced retroflex fricative [ʐ], devoiced to [ʂ] in the vicinity of voiceless consonants.
It is also analogous to Polish rz.