D major 13th chord
Dmaj13 chord for piano with keyboard diagram.
Explanation: The D major thirteenth is a six-note chord (the 11th, G in the case of Dmaj13, is normally excluded). For practical reasons the chord is normally played with omitted notes and/or inverted. It is often abbreviated as Dmaj13 (not to be confused with D13).
Theory: The D major thirteenth chord is constructed by extending the major eleventh chord with a major thirteenth note.
Notes: D - F# - A - C# - E - B