Bb 9th chord

Bb9 chord (also called Dominant 9th chord) for piano presented by keyboard diagrams.
Explanation: The Bb ninth is a five-note chord. Due to practical circumstances, however, the fifth (F) is often omitted and/or the chord is played inverted. The chord is often abbreviated as Bb9.
Theory: The Bb ninth chord is constructed with a root, a major third, a perfect fifth, a minor seventh and a major ninth.

Bb9

Bb9 chord diagram
Notes: Bb - D - F - Ab - C

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Bb9 inverted

Bb9 chord diagram
One of many possible inversions (Bb9/Ab)

Bb9 chord diagram
Notes: Bb - F (left hand) Ab - C - D (right hand)
Two-hand voicing

Bb chord categories

Bb Bbm Bb7 Bbm7 Bbmaj7 BbmM7 Bb6 Bbm6 Bb6/9 Bb5 Bb9 Bbm9 Bbmaj9 Bb11 Bbm11 Bb13 Bbm13 Bbmaj13 Bbadd Bb7-5 Bb7+5 Bbsus Bbdim Bbdim7 Bbm7b5 Bbaug Bbaug7