A flat major seventh flat sixth piano chord - AbM7b6
The A flat major seventh flat sixth chord is a 4-note chord consisting of the notes Ab, C, Fb and G.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as AbM7b6.
Interactive piano diagram for the A flat major seventh flat sixth chord
Chords that are a subset of AbM7b6. These contain less notes but all of them are included in AbM7b6.