A#maj11 chord

The A-sharp major eleventh chord (abbreviated A#maj11 chord) is a six-note chord consisting of the notes A♯, C, E♯, G, B♯, and D♯. The chord is formed by adding an eleventh to the A-sharp major ninth chord.

In practice, the fifth (E♯) is often omitted from the A#maj11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.