Bbm11 chord

The B-flat minor eleventh chord (abbreviated Bbm11 chord) is a six-note chord consisting of the notes B♭, D♭, F, A♭, C, and E♭. The chord is formed by adding an eleventh to the B-flat minor ninth chord.

In practice, the fifth (F) is often omitted from the Bbm11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.