C#m11 chord

The C-sharp minor eleventh chord (abbreviated C#m11 chord) is a six-note chord consisting of the notes C♯, E, G♯, B, D♯, and F♯. The chord is formed by adding an eleventh to the C-sharp minor ninth chord.

In practice, the fifth (G♯) is often omitted from the C#m11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.