Abm11 chord

The A-flat minor eleventh chord (abbreviated Abm11 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-flat minor ninth chord.

In practice, the fifth (E♭) is often omitted from the Abm11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.