A11 chord
The A dominant eleventh chord (abbreviated "A11 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 a A dominant ninth chord.
In practice, the third (C♯) and fifth (E) are often omitted from the A11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.
Name
A dominant eleventh chord
Notes
A C♯ E G B D
Intervals
1 3 5 ♭7 9 11
Chord symbol
A11
Type
hexad (six-note chord)