Gbm9 chord

The G-flat minor ninth chord (abbreviated Gbm9 chord) is a five-note chord consisting of the notes G♭, B♭♭, D♭, F♭, and A♭. The chord is formed by adding a major ninth to the G-flat minor seventh chord.

In practice, the fifth (D♭) is sometimes omitted from the Gbm9 chord because it's not always possible to play all notes simultaneously.