A trill is made by the articulator being held in place and the airstream causing it to vibrate.
The coronal trill is most frequently alveolar [r͇], but dental and postalveolar articulations [r̪] and [r̠] also occur.
A symbol for this sound, [ɼ], has been dropped from the IPA, and it is now generally transcribed as a raised r, [r̝].
A nasal trill [r̃] has been described from some dialects of Romanian, and is posited as an intermediate historical step in rhotacism.
However, the phonetic variation of the sound is considerable, and it is not clear how frequently it is actually trilled.
Snoring typically consists of vibration of the uvula and the soft palate (velum), which may be described as an ingressive velic trill.
[12] The Extensions to the IPA identifies an egressive fricative pronounced with this same configuration, common with a cleft palate, as velopharyngeal [ʩ], and with accompanying uvular trill as [ʩ𐞪] ([ʩʀ]) or [𝼀] ().
[13] Lateral trills are also possible and may be pronounced by initiating [ɬ] or [ɮ] with an especially forceful airflow.
Lateral coronal trills are sometimes used to imitate bird calls, and are a component of Donald Duck talk.