The word "triller" refers to a type of ornamental musical flourish that typically features a rapid alternation of two adjacent notes. Although "triller" is the most common term for this technique, there are several other synonyms that can be used to describe it. Some alternative terms for "triller" include tremolo, shake, waver, flutter, and vibrato. Each of these terms describes a similar technique whereby a performer rapidly and repeatedly alternates between two adjacent notes in a musical phrase. Regardless of the specific terminology used, this technique adds a flourish and vibrancy to the musical performance and is a popular ornamentation technique across many genres of music.