U+1D138 "𝄸" Musical Symbol Quindicesima Alta Unicode Character

U+1D138 "𝄸" Musical Symbol Quindicesima Alta is a notation mark used in musical scores to instruct a performer to play the indicated passage two octaves higher than written. The term "quindicesima alta" is Italian for "high fifteenth," where the number fifteen refers to the interval of two octaves, encompassing fifteen diatonic scale degrees. This symbol is typically placed above a section of staff notation and applies until a corresponding natural or cancellation mark is encountered, similar in function to the ottava alta (one octave higher) symbol but extending the range by an additional octave.