1b3bb7b5
Fig. 1 · Ddim7 on the keyboard

piano chord

Ddim7

D1F♭3A♭♭5C♭♭♭7

Three minor thirds stacked. The seventh is doubly diminished, which is why it is written with a double flat.

on guitaron ukulelethe scale

What is true of it

Ddim7 is D, F, A♭ and C♭ — 1, b3, b5 and bb7 counted from D.

D in other shapes

D7dominant seventhDmaj7major seventhDm7minor seventhDmajorDmminorDdimdiminished

Cdim7C♯dim7D♭dim7D♯dim7E♭dim7Edim7Fdim7F♯dim7all 374