C11 chord
The C dominant eleventh chord (abbreviated "C11 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 a C dominant ninth chord.
In practice, the third (E) and fifth (G) are often omitted from the C11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.
Name
C dominant eleventh chord
Notes
C E G B♭ D F
Intervals
1 3 5 ♭7 9 11
Chord symbol
C11
Type
Hexad (six-note chord)