trill

باللغة العربية: تَكْرِير

1. A rapid alternation between an indicated note and the one above it as an ornament; in musical notation usually indicated with the letters tr written above the staff.
2. A type of consonantal sound that is produced by vibrations of the tongue against the place of articulation: for example, Spanish ⟨rr⟩, /r/.
3. A tremulous high-pitched vocal sound produced by cats.

الجمع trills