A flat diminished seventh piano chord - Abdim7

The A flat diminished seventh chord is a 4-note chord consisting of the notes Ab, Cb, Ebb and Gbb.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Abdim7.

Interactive piano diagram for the A flat diminished seventh chord

Piano keyboard displaying the A flat diminished seventh chord with the notes Cb B G# Ab D E# F

Reduced chords

Chords that are a subset of Abdim7. These contain less notes but all of them are included in Abdim7.

A flat diminished seventh piano chord chart image

In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Abdim7 chord. Feel free to save or share the image as needed.

Piano chord chart for the A flat diminished seventh chord (Abdim7). The notes Ab, Cb, Ebb and Gbb are highlighted.