Voiceless alveolar trill

Voiceless alveolar trill
r̥
IPA Number	122 402A
Audio sample
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Encoding
X-SAMPA	r_0
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The voiceless alveolar trill differs from the voiced alveolar trill /r/ in its phonation (whether or not the vocal chords are vibrating while pronouncing the sound). It is used in a few languages. In languages that also have the voiced alveolar trill, it can be a similar sound or an allophone (another way a certain sound can be pronounced).

In Proto-Indo-European, the sound *sr became a sound spelled ⟨ῥ⟩, with the letter for /r/ and the diacritic for /h/, in Ancient Greek. This sound was probably a voiceless alveolar trill. It became the regular word-initial (meaning "at the start of a word") allophone of /r/ in standard Attic Greek. This sound has disappeared in Modern Greek.