The G flat minor/major ninth chord is a 5-note chord consisting of the notes Gb, Bbb, Db, F and Ab.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as GbmM9.
Interactive piano diagram for the G flat minor/major ninth chord
Chords that are a subset of GbmM9. These contain less notes but all of them are included in GbmM9.