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A trill consonant is a consonant that is made by vibrating an articulator, or hitting it many times against something else. For example, the <rr> in the Spanish word "perro" is an alveolar trill, commonly known as a rolled r, where the tongue is hit many times against the alveolar ridge, or the place just behind the teeth. This vibration is caused by a flow of air.
There are three trill consonants in the International Phonetic Alphabet. These are:
- [r] - alveolar trill
- [ʙ] - bilabial trill, where the lips are trilled.
- [ʀ] - uvular trill, where the uvula is trilled.