The D flat minor/major ninth chord is a 5-note chord consisting of the notes Db, Fb, Ab, C and Eb.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as DbmM9.
Interactive piano diagram for the D flat minor/major ninth chord
Chords that are a subset of DbmM9. These contain less notes but all of them are included in DbmM9.