C sharp major seventh flat sixth piano chord - C#M7b6
The C sharp major seventh flat sixth chord is a 4-note chord consisting of the notes C#, E#, A and B#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as C#M7b6.
Interactive piano diagram for the C sharp major seventh flat sixth chord
Chords that are a subset of C#M7b6. These contain less notes but all of them are included in C#M7b6.