The A-sharp major sixth-ninth chord (abbreviated "A#6/9 chord") is a five-note chord consisting of the notes A♯, C, E♯, F, and B♯. The chord is formed by adding a major sixth and a major ninth to a A-sharp major chord.
A-sharp major sixth-ninth chord
A♯ C E♯ F B♯
1 3 5 6 9
Pentad (five-note chord)