Abm9 piano chord

The chord Abm9 that is shown here contains the notes: Ab, B, Bb, Gb.
The root of the chord is Ab (The lowest sound - the bass - is AB).
The scale from which the chord is derived is Minor ninth chord (1–♭3–5–♭7–9), and the degrees of the scale are: 1, ♭3, 5, ♭7, 9.