B thirteenth chord
B13 chord for piano presented by keyboard diagrams.
Explanation: The B thirteenth is a seven note chord. Due to practical circumstances, some notes (as a suggestion fifth, ninth, and eleventh) is omitted and the chord is played inverted. The chord is often abbreviated as B13.
Theory: The B thirteenth chord is constructed by adding a third to an eleventh chord.
Notes: B - D# - F# - A - C# - E - G#