Db11 chord

The D-flat dominant eleventh chord (abbreviated Db11 chord) is a six-note chord consisting of the notes D♭, F, A♭, C♭, E♭, and G♭. The chord is formed by adding an eleventh to the D-flat dominant ninth chord.

In practice, the third (F) and fifth (A♭) are often omitted from the Db11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.