Fm11 chord

The F minor eleventh chord (abbreviated Fm11 chord) is a six-note chord consisting of the notes F, A♭, C, E♭, G, and B♭. The chord is formed by adding an eleventh to the F minor ninth chord.

In practice, the fifth (C) is often omitted from the Fm11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.