Three notes across one string set.
Ddim is D, F and Ab — Dm with the fifth lowered as well.
It sounds compressed and unstable in every direction. Rarely a destination; it is where a line passes through on the way somewhere.

| D | F | Ab |
|---|---|---|
| 1 | ♭3 | ♭5 |
Unstable — it does not sit still.
Also written D°, Do or D diminished. The same chord either way; which spelling you meet depends on who wrote the chart.
Three notes on one string set. No seventh, so nothing is claimed about the chord beyond its quality.
Thin on their own, excellent over a bass line or against someone else’s harmony.
Ddim has 49 of them, on the high-middle three, the top three strings, the top four strings, the bottom three strings, the middle four strings, the low-middle three, the bottom four strings, strings 5-3-2-1 and strings 6-4-3-2, from open position up to the 13th — every inversion the chord has: D in the bass, F in the bass and Ab in the bass. The one to learn first is the F shape at the nut, which is the easiest grip here.
6 of them sit on the top four strings, so you can run the inversions up one set without changing strings — which is the whole reason to learn them as a family rather than as separate grips.
Start with xx01x1 — 1 open string and only 2 fretted notes. 1 of the 5 shapes here sits in open position. None of them needs a barre. Together they cover the neck from the 1st fret to the 13th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| xx01x1 | open position | D, root position | F | 1 open string |
| x53x34 | 3rd fret | D, root position | Ab | all fretted |
| x5676x | 5th fret | D, root position | F | all fretted |
| 10-8-x-10-9-x | 8th fret | D, root position | Ab | all fretted |
| x-x-12-13-x-13 | 12th fret | D, root position | F | all fretted |
The same notes rebuilt from scratch give 2 open string voicings, each on its own page.
Tensions. A shell of Ddim, root, third and seventh, leaves a string free, and the tones that belong over it are the 11 (G) and the b13 (Bb).
In which keys. Every note of Ddim belongs to C minor (the ii°, the supertonic) and Eb major (the vii°, the leading tone).
Every note of Ddim is in D blues, D locrian, D altered, D diminished and D half-whole diminished.
Change one note of Ddim and you have Dm (the flat fifth becomes a fifth), Ddim7 (add the sixth), Dm7b5 (add the flat seventh) or DmMaj7b5 (add the major seventh).
Ddim is a diminished chord — root, minor third, flat fifth. Diminished and half-diminished chords on every root.
On Ddim’s sound and use this page follows Stefan Kostka, Dorothy Payne & Byron Almén, Tonal Harmony (McGraw-Hill, 8th ed., 2018). The shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.