What does the term "Ottava" (8va) indicate in sheet music?

The term "Ottava," indicated as "8va" in sheet music, signifies that the passage should be played one octave higher than written. This instruction is often used to make the music easier to read or to convey a particular sound or effect that is more easily produced at a higher pitch. The notation typically appears above the staff where the instruction begins and is generally followed by a line that indicates where the player should return to the original octave.

Utilizing "8va" allows composers to achieve a brighter and more dynamic sound without cluttering the notation with additional ledger lines. It helps performers interpret the music accurately while maintaining clarity in the written score. The indication is thus essential for understanding how to interpret the notes accurately in terms of pitch, ensuring the intended musical expression is maintained.