piano chord
D13
D1F♯3A5C♭7E9B13
Seven notes in theory and four or five in anyone’s hands: root, third, seventh and thirteenth carry it.
What is true of it
D13 is D, F♯, A, C, E and B — 1, 3, 5, b7, 9 and 13 counted from D.
On an instrument that cannot reach all 6, the 5, 9 and 1 go first, in that order.