B eleventh chords
B11 chord for piano presented by keyboard diagrams.
Explanation: The B eleventh is a six note chord. Due to practical circumstances and/or dissonance the third (D#) is omitted in B11 and/or the chord is played inverted. The chord is often abbreviated as B11.
Theory: The B eleventh chord is constructed by adding a third to a ninth chord.
Notes: B - D# - F# - A - C# - E