Trill consonant

A trill consonant is a consonant that is made by vibrating an articulator, or hitting it many times against something else. For example, the &lt;rr&gt; 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: