The type of musical notation that indicates how long to hold a note is called rhythmic notation. In musical scores, rhythmic notation is represented by different note values, such as whole notes, half notes, quarter notes, eighth notes, and so forth. Each type of note has a specific duration that guides the musician on how long to play the note relative to the tempo of the piece. Additionally, rests are used to indicate periods of silence corresponding to these note values. Understanding rhythmic notation is essential for performing music accurately, as it conveys timing, coordination, and the overall flow of the composition.