Trill
A trill written as 
or 
is an ornamentation sign.
Ornamentation means: replace the written note with a sequence of alternating short notes of written pitch and the next higher note (adjustable with playback options).
A trill written as or is an ornamentation sign.
Ornamentation means: replace the written note with a sequence of alternating short notes of written pitch and the next higher note (adjustable with playback options).