The B flat minor/major ninth chord is a 5-note chord consisting of the notes Bb, Db, F, A and C.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as BbmM9.
Interactive piano diagram for the B flat minor/major ninth chord
Chords that are a subset of BbmM9. These contain less notes but all of them are included in BbmM9.