R̃

R̃, is a Latin R with a diacritical tilde.
In Lithuanian, the R with tilde “R̃, r̃” is rarely used and is found in some grammar texts, dictionaries or textbooks. The tilde is used like the circumflex, it indicates the long tonic accent. Therefore, the R with a tilde indicates an /r/ that is part of a diphthong with a tonic accent.
It is not to be confused with Ȓ, R̄ or Ř.
It was used in the Albanian Agimi alphabet for the voiced [alveolar trill], now represented by the digraph Rr.
It is also used in Hausa to differentiate the alveolar tap /ɾ/, represented by R, from the retroflex one.
In the International Phonetic Alphabet, represents a nasalized alveolar trill. It is a combination of the IPA symbols, an alveolar trill, combined with the tilde diacritic, which indicates nasalization. PHOIBLE lists the phoneme as an attested sound segment in 10 languages, mostly located in the equatorial regions of Africa.