The retroflex trill has been reported from the Dravidian language Toda, and confirmed with laboratory measurements. Peter Ladefoged transcribes it with the IPA symbol normally associated with the retroflex flap, ɽ. The Dravidian family of languages includes approximately 26 languages that are mainly spoken in southern India and Sri Lanka, as well as certain areas in Pakistan, Nepal, and eastern and central India. ... Peter Ladefoged (1925-) is a British-American phonetician. ... The retroflex flap is a type of consonantal sound, used in a few spoken languages, including Urdu, Hausa and Norwegian. ...
In phonetics, a trill is a consonantal sound produced by vibrations between the articulator and the place of articulation.
Whereas with a flap (or tap), a specific gesture is used to strike the active articulator against the passive one, in the case of a trill the articulator is held in place, where the airstream causes it to vibrate.
A retroflextrill found in Toda has been transcribed [ɽ] (that is, the same as the retroflex flap), but might be less ambiguously written [ɽ͡r].
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