A#13 chord

The A-sharp dominant thirteenth chord (abbreviated A#13 chord) is a seven-note chord consisting of the notes A♯, C, E♯, G♯, B♯, D♯, and F. The chord is formed by adding a thirteenth to the A-sharp dominant eleventh chord.

In practice, the fifth (E♯) and eleventh (D♯) are often omitted from the A#13 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.